From c882248348510265e1926b0abc031b4c6fb0f97f Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Fri, 22 May 2009 20:07:26 +0000
Subject: [PATCH] (svn r16388) -Codechange: move u.air to Aircraft

---
 src/aircraft.h                |   7 ++
 src/aircraft_cmd.cpp          | 208 +++++++++++++++++-----------------
 src/newgrf_engine.cpp         |  10 +-
 src/openttd.cpp               |   4 +-
 src/order_cmd.cpp             |  11 +-
 src/saveload/oldloader_sl.cpp |  10 +-
 src/saveload/vehicle_sl.cpp   |  39 +++----
 src/station.cpp               |   7 +-
 src/station_cmd.cpp           |   3 +-
 src/vehicle.cpp               |  13 ++-
 src/vehicle_base.h            |  10 --
 src/vehicle_cmd.cpp           |   8 +-
 src/water_cmd.cpp             |   2 +-
 13 files changed, 170 insertions(+), 162 deletions(-)

diff --git a/src/aircraft.h b/src/aircraft.h
index 7f3c8bff76..d4e11f206c 100644
--- a/src/aircraft.h
+++ b/src/aircraft.h
@@ -92,6 +92,13 @@ byte GetAircraftFlyingAltitude(const Aircraft *v);
  * As side-effect the vehicle type is set correctly.
  */
 struct Aircraft : public Vehicle {
+	uint16 crashed_counter;
+	uint16 cached_max_speed;
+	byte pos;
+	byte previous_pos;
+	StationID targetairport;
+	byte state;
+
 	/** Initializes the Vehicle to an aircraft */
 	Aircraft() { this->type = VEH_AIRCRAFT; }
 
diff --git a/src/aircraft_cmd.cpp b/src/aircraft_cmd.cpp
index 1a04698195..c06e3e64b3 100644
--- a/src/aircraft_cmd.cpp
+++ b/src/aircraft_cmd.cpp
@@ -40,7 +40,7 @@ void Aircraft::UpdateDeltaXY(Direction direction)
 		default: NOT_REACHED();
 		case AIR_AIRCRAFT:
 		case AIR_HELICOPTER:
-			switch (this->u.air.state) {
+			switch (this->state) {
 				case ENDTAKEOFF:
 				case LANDING:
 				case HELILANDING:
@@ -173,7 +173,7 @@ SpriteID GetRotorImage(const Aircraft *v)
 	}
 
 	/* Return standard rotor sprites if there are no custom sprites for this helicopter */
-	return SPR_ROTOR_STOPPED + w->u.air.state;
+	return SPR_ROTOR_STOPPED + w->state;
 }
 
 static SpriteID GetAircraftIcon(EngineID engine)
@@ -368,14 +368,14 @@ CommandCost CmdBuildAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 			assert(i != apc->nof_depots);
 			if (st->airport_tile + ToTileIndexDiff(apc->airport_depots[i]) == tile) {
 				assert(apc->layout[i].heading == HANGAR);
-				v->u.air.pos = apc->layout[i].position;
+				v->pos = apc->layout[i].position;
 				break;
 			}
 		}
 
-		v->u.air.state = HANGAR;
-		v->u.air.previous_pos = v->u.air.pos;
-		v->u.air.targetairport = GetStationIndex(tile);
+		v->state = HANGAR;
+		v->previous_pos = v->pos;
+		v->targetairport = GetStationIndex(tile);
 		v->SetNext(u);
 
 		v->service_interval = _settings_game.vehicle.servint_aircraft;
@@ -411,7 +411,7 @@ CommandCost CmdBuildAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 			w->cur_image = SPR_ROTOR_STOPPED;
 			w->random_bits = VehicleRandomBits();
 			/* Use rotor's air.state to store the rotor animation frame */
-			w->u.air.state = HRS_ROTOR_STOPPED;
+			w->state = HRS_ROTOR_STOPPED;
 			w->UpdateDeltaXY(INVALID_DIR);
 
 			u->SetNext(w);
@@ -594,8 +594,8 @@ static void CheckIfAircraftNeedsService(Aircraft *v)
 
 	/* only goto depot if the target airport has terminals (eg. it is airport) */
 	if (st->airport_tile != INVALID_TILE && st->Airport()->terminals != NULL) {
-//		printf("targetairport = %d, st->index = %d\n", v->u.air.targetairport, st->index);
-//		v->u.air.targetairport = st->index;
+//		printf("targetairport = %d, st->index = %d\n", v->targetairport, st->index);
+//		v->targetairport = st->index;
 		v->current_order.MakeGoToDepot(st->index, ODTFB_SERVICE);
 		InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
 	} else if (v->current_order.IsType(OT_GOTO_DEPOT)) {
@@ -655,7 +655,7 @@ static void HelicopterTickHandler(Aircraft *v)
 	if (v->current_order.IsType(OT_LOADING) || (v->vehstatus & VS_STOPPED)) {
 		if (u->cur_speed != 0) {
 			u->cur_speed++;
-			if (u->cur_speed >= 0x80 && u->u.air.state == HRS_ROTOR_MOVING_3) {
+			if (u->cur_speed >= 0x80 && u->state == HRS_ROTOR_MOVING_3) {
 				u->cur_speed = 0;
 			}
 		}
@@ -672,13 +672,13 @@ static void HelicopterTickHandler(Aircraft *v)
 
 	SpriteID img;
 	if (spd == 0) {
-		u->u.air.state = HRS_ROTOR_STOPPED;
+		u->state = HRS_ROTOR_STOPPED;
 		img = GetRotorImage(v);
 		if (u->cur_image == img) return;
 	} else if (tick >= spd) {
 		u->tick_counter = 0;
-		u->u.air.state++;
-		if (u->u.air.state > HRS_ROTOR_MOVING_3) u->u.air.state = HRS_ROTOR_MOVING_1;
+		u->state++;
+		if (u->state > HRS_ROTOR_MOVING_3) u->state = HRS_ROTOR_MOVING_1;
 		img = GetRotorImage(v);
 	} else {
 		return;
@@ -757,9 +757,9 @@ void UpdateAircraftCache(Aircraft *v)
 		/* Convert from original units to (approx) km/h */
 		max_speed = (max_speed * 129) / 10;
 
-		v->u.air.cached_max_speed = max_speed;
+		v->cached_max_speed = max_speed;
 	} else {
-		v->u.air.cached_max_speed = 0xFFFF;
+		v->cached_max_speed = 0xFFFF;
 	}
 }
 
@@ -791,9 +791,9 @@ static int UpdateAircraftSpeed(Aircraft *v, uint speed_limit = SPEED_LIMIT_NONE,
 	 * and take-off speeds being too low. */
 	speed_limit *= _settings_game.vehicle.plane_speed;
 
-	if (v->u.air.cached_max_speed < speed_limit) {
+	if (v->cached_max_speed < speed_limit) {
 		if (v->cur_speed < speed_limit) hard_limit = false;
-		speed_limit = v->u.air.cached_max_speed;
+		speed_limit = v->cached_max_speed;
 	}
 
 	speed_limit = min(speed_limit, v->max_speed);
@@ -889,7 +889,7 @@ static byte AircraftGetEntryPoint(const Aircraft *v, const AirportFTAClass *apc)
 	 * or it will simply crash in next tick */
 	TileIndex tile = 0;
 
-	const Station *st = Station::GetIfValid(v->u.air.targetairport);
+	const Station *st = Station::GetIfValid(v->targetairport);
 	if (st != NULL) {
 		/* Make sure we don't go to INVALID_TILE if the airport has been removed. */
 		tile = (st->airport_tile != INVALID_TILE) ? st->airport_tile : st->xy;
@@ -921,7 +921,7 @@ static bool AircraftController(Aircraft *v)
 	int count;
 
 	/* NULL if station is invalid */
-	const Station *st = Station::GetIfValid(v->u.air.targetairport);
+	const Station *st = Station::GetIfValid(v->targetairport);
 	/* INVALID_TILE if there is no station */
 	TileIndex tile = INVALID_TILE;
 	if (st != NULL) {
@@ -933,11 +933,11 @@ static bool AircraftController(Aircraft *v)
 	/* prevent going to INVALID_TILE if airport is deleted. */
 	if (st == NULL || st->airport_tile == INVALID_TILE) {
 		/* Jump into our "holding pattern" state machine if possible */
-		if (v->u.air.pos >= afc->nofelements) {
-			v->u.air.pos = v->u.air.previous_pos = AircraftGetEntryPoint(v, afc);
-		} else if (v->u.air.targetairport != v->current_order.GetDestination()) {
+		if (v->pos >= afc->nofelements) {
+			v->pos = v->previous_pos = AircraftGetEntryPoint(v, afc);
+		} else if (v->targetairport != v->current_order.GetDestination()) {
 			/* If not possible, just get out of here fast */
-			v->u.air.state = FLYING;
+			v->state = FLYING;
 			UpdateAircraftCache(v);
 			AircraftNextAirportPos_and_Order(v);
 			/* get aircraft back on running altitude */
@@ -947,7 +947,7 @@ static bool AircraftController(Aircraft *v)
 	}
 
 	/*  get airport moving data */
-	const AirportMovingData *amd = afc->MovingData(v->u.air.pos);
+	const AirportMovingData *amd = afc->MovingData(v->pos);
 
 	int x = TileX(tile) * TILE_SIZE;
 	int y = TileY(tile) * TILE_SIZE;
@@ -983,7 +983,7 @@ static bool AircraftController(Aircraft *v)
 			/* FIXME - AircraftController -> if station no longer exists, do not land
 			 * helicopter will circle until sign disappears, then go to next order
 			 * what to do when it is the only order left, right now it just stays in 1 place */
-			v->u.air.state = FLYING;
+			v->state = FLYING;
 			UpdateAircraftCache(v);
 			AircraftNextAirportPos_and_Order(v);
 			return false;
@@ -1102,7 +1102,7 @@ static bool AircraftController(Aircraft *v)
 		if (amd->flag & AMED_LAND) {
 			if (st->airport_tile == INVALID_TILE) {
 				/* Airport has been removed, abort the landing procedure */
-				v->u.air.state = FLYING;
+				v->state = FLYING;
 				UpdateAircraftCache(v);
 				AircraftNextAirportPos_and_Order(v);
 				/* get aircraft back on running altitude */
@@ -1142,21 +1142,21 @@ static bool AircraftController(Aircraft *v)
 
 static bool HandleCrashedAircraft(Aircraft *v)
 {
-	v->u.air.crashed_counter += 3;
+	v->crashed_counter += 3;
 
 	Station *st = GetTargetAirportIfValid(v);
 
 	/* make aircraft crash down to the ground */
-	if (v->u.air.crashed_counter < 500 && st == NULL && ((v->u.air.crashed_counter % 3) == 0) ) {
+	if (v->crashed_counter < 500 && st == NULL && ((v->crashed_counter % 3) == 0) ) {
 		uint z = GetSlopeZ(v->x_pos, v->y_pos);
 		v->z_pos -= 1;
 		if (v->z_pos == z) {
-			v->u.air.crashed_counter = 500;
+			v->crashed_counter = 500;
 			v->z_pos++;
 		}
 	}
 
-	if (v->u.air.crashed_counter < 650) {
+	if (v->crashed_counter < 650) {
 		uint32 r;
 		if (Chance16R(1,32,r)) {
 			static const DirDiff delta[] = {
@@ -1172,7 +1172,7 @@ static bool HandleCrashedAircraft(Aircraft *v)
 				GB(r, 8, 4),
 				EV_EXPLOSION_SMALL);
 		}
-	} else if (v->u.air.crashed_counter >= 10000) {
+	} else if (v->crashed_counter >= 10000) {
 		/*  remove rubble of crashed airplane */
 
 		/* clear runway-in on all airports, set by crashing plane
@@ -1276,7 +1276,7 @@ void HandleMissingAircraftOrders(Aircraft *v)
 TileIndex Aircraft::GetOrderStationLocation(StationID station)
 {
 	/* Orders are changed in flight, ensure going to the right station. */
-	if (this->u.air.state == FLYING) {
+	if (this->state == FLYING) {
 		AircraftNextAirportPos_and_Order(this);
 	}
 
@@ -1294,7 +1294,7 @@ void Aircraft::MarkDirty()
 static void CrashAirplane(Aircraft *v)
 {
 	v->vehstatus |= VS_CRASHED;
-	v->u.air.crashed_counter = 0;
+	v->crashed_counter = 0;
 
 	CreateEffectVehicleRel(v, 4, 4, 8, EV_EXPLOSION_LARGE);
 
@@ -1330,7 +1330,7 @@ static void CrashAirplane(Aircraft *v)
 
 static void MaybeCrashAirplane(Aircraft *v)
 {
-	Station *st = Station::Get(v->u.air.targetairport);
+	Station *st = Station::Get(v->targetairport);
 
 	/* FIXME -- MaybeCrashAirplane -> increase crashing chances of very modern airplanes on smaller than AT_METROPOLITAN airports */
 	uint16 prob = 0x10000 / 1500;
@@ -1356,8 +1356,8 @@ static void AircraftEntersTerminal(Aircraft *v)
 {
 	if (v->current_order.IsType(OT_GOTO_DEPOT)) return;
 
-	Station *st = Station::Get(v->u.air.targetairport);
-	v->last_station_visited = v->u.air.targetairport;
+	Station *st = Station::Get(v->targetairport);
+	v->last_station_visited = v->targetairport;
 
 	/* Check if station was ever visited before */
 	if (!(st->had_vehicle_of_type & HVOT_AIRCRAFT)) {
@@ -1391,12 +1391,12 @@ static void AircraftLandAirplane(Aircraft *v)
 void AircraftNextAirportPos_and_Order(Aircraft *v)
 {
 	if (v->current_order.IsType(OT_GOTO_STATION) || v->current_order.IsType(OT_GOTO_DEPOT)) {
-		v->u.air.targetairport = v->current_order.GetDestination();
+		v->targetairport = v->current_order.GetDestination();
 	}
 
 	const Station *st = GetTargetAirportIfValid(v);
 	const AirportFTAClass *apc = st == NULL ? GetAirport(AT_DUMMY) : st->Airport();
-	v->u.air.pos = v->u.air.previous_pos = AircraftGetEntryPoint(v, apc);
+	v->pos = v->previous_pos = AircraftGetEntryPoint(v, apc);
 }
 
 void AircraftLeaveHangar(Aircraft *v)
@@ -1470,20 +1470,20 @@ static inline bool CheckSendAircraftToHangarForReplacement(const Vehicle *v)
 static void AircraftEventHandler_EnterTerminal(Aircraft *v, const AirportFTAClass *apc)
 {
 	AircraftEntersTerminal(v);
-	v->u.air.state = apc->layout[v->u.air.pos].heading;
+	v->state = apc->layout[v->pos].heading;
 }
 
 static void AircraftEventHandler_EnterHangar(Aircraft *v, const AirportFTAClass *apc)
 {
 	VehicleEnterDepot(v);
-	v->u.air.state = apc->layout[v->u.air.pos].heading;
+	v->state = apc->layout[v->pos].heading;
 }
 
 /** In an Airport Hangar */
 static void AircraftEventHandler_InHangar(Aircraft *v, const AirportFTAClass *apc)
 {
 	/* if we just arrived, execute EnterHangar first */
-	if (v->u.air.previous_pos != v->u.air.pos) {
+	if (v->previous_pos != v->pos) {
 		AircraftEventHandler_EnterHangar(v, apc);
 		return;
 	}
@@ -1499,10 +1499,10 @@ static void AircraftEventHandler_InHangar(Aircraft *v, const AirportFTAClass *ap
 		return;
 
 	/* if the block of the next position is busy, stay put */
-	if (AirportHasBlock(v, &apc->layout[v->u.air.pos], apc)) return;
+	if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
 
 	/* We are already at the target airport, we need to find a terminal */
-	if (v->current_order.GetDestination() == v->u.air.targetairport) {
+	if (v->current_order.GetDestination() == v->targetairport) {
 		/* FindFreeTerminal:
 		 * 1. Find a free terminal, 2. Occupy it, 3. Set the vehicle's state to that terminal */
 		if (v->subtype == AIR_HELICOPTER) {
@@ -1512,7 +1512,7 @@ static void AircraftEventHandler_InHangar(Aircraft *v, const AirportFTAClass *ap
 		}
 	} else { // Else prepare for launch.
 		/* airplane goto state takeoff, helicopter to helitakeoff */
-		v->u.air.state = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : TAKEOFF;
+		v->state = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : TAKEOFF;
 	}
 	AircraftLeaveHangar(v);
 	AirportMove(v, apc);
@@ -1522,7 +1522,7 @@ static void AircraftEventHandler_InHangar(Aircraft *v, const AirportFTAClass *ap
 static void AircraftEventHandler_AtTerminal(Aircraft *v, const AirportFTAClass *apc)
 {
 	/* if we just arrived, execute EnterTerminal first */
-	if (v->u.air.previous_pos != v->u.air.pos) {
+	if (v->previous_pos != v->pos) {
 		AircraftEventHandler_EnterTerminal(v, apc);
 		/* on an airport with helipads, a helicopter will always land there
 		 * and get serviced at the same time - setting */
@@ -1541,7 +1541,7 @@ static void AircraftEventHandler_AtTerminal(Aircraft *v, const AirportFTAClass *
 	if (v->current_order.IsType(OT_NOTHING)) return;
 
 	/* if the block of the next position is busy, stay put */
-	if (AirportHasBlock(v, &apc->layout[v->u.air.pos], apc)) return;
+	if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
 
 	/* airport-road is free. We either have to go to another airport, or to the hangar
 	 * ---> start moving */
@@ -1551,7 +1551,7 @@ static void AircraftEventHandler_AtTerminal(Aircraft *v, const AirportFTAClass *
 		case OT_GOTO_STATION: // ready to fly to another airport
 			break;
 		case OT_GOTO_DEPOT:   // visit hangar for serivicing, sale, etc.
-			go_to_hangar = v->current_order.GetDestination() == v->u.air.targetairport;
+			go_to_hangar = v->current_order.GetDestination() == v->targetairport;
 			break;
 		case OT_CONDITIONAL:
 			/* In case of a conditional order we just have to wait a tick
@@ -1560,14 +1560,14 @@ static void AircraftEventHandler_AtTerminal(Aircraft *v, const AirportFTAClass *
 			return;
 		default:  // orders have been deleted (no orders), goto depot and don't bother us
 			v->current_order.Free();
-			go_to_hangar = Station::Get(v->u.air.targetairport)->Airport()->nof_depots != 0;
+			go_to_hangar = Station::Get(v->targetairport)->Airport()->nof_depots != 0;
 	}
 
 	if (go_to_hangar) {
-		v->u.air.state = HANGAR;
+		v->state = HANGAR;
 	} else {
 		/* airplane goto state takeoff, helicopter to helitakeoff */
-		v->u.air.state = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : TAKEOFF;
+		v->state = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : TAKEOFF;
 	}
 	AirportMove(v, apc);
 }
@@ -1580,25 +1580,25 @@ static void AircraftEventHandler_General(Aircraft *v, const AirportFTAClass *apc
 static void AircraftEventHandler_TakeOff(Aircraft *v, const AirportFTAClass *apc)
 {
 	PlayAircraftSound(v); // play takeoffsound for airplanes
-	v->u.air.state = STARTTAKEOFF;
+	v->state = STARTTAKEOFF;
 }
 
 static void AircraftEventHandler_StartTakeOff(Aircraft *v, const AirportFTAClass *apc)
 {
-	v->u.air.state = ENDTAKEOFF;
+	v->state = ENDTAKEOFF;
 	v->UpdateDeltaXY(INVALID_DIR);
 }
 
 static void AircraftEventHandler_EndTakeOff(Aircraft *v, const AirportFTAClass *apc)
 {
-	v->u.air.state = FLYING;
+	v->state = FLYING;
 	/* get the next position to go to, differs per airport */
 	AircraftNextAirportPos_and_Order(v);
 }
 
 static void AircraftEventHandler_HeliTakeOff(Aircraft *v, const AirportFTAClass *apc)
 {
-	v->u.air.state = FLYING;
+	v->state = FLYING;
 	v->UpdateDeltaXY(INVALID_DIR);
 
 	/* get the next position to go to, differs per airport */
@@ -1614,7 +1614,7 @@ static void AircraftEventHandler_HeliTakeOff(Aircraft *v, const AirportFTAClass
 
 static void AircraftEventHandler_Flying(Aircraft *v, const AirportFTAClass *apc)
 {
-	Station *st = Station::Get(v->u.air.targetairport);
+	Station *st = Station::Get(v->targetairport);
 
 	/* runway busy or not allowed to use this airstation, circle */
 	if (apc->flags & (v->subtype == AIR_HELICOPTER ? AirportFTAClass::HELICOPTERS : AirportFTAClass::AIRPLANES) &&
@@ -1624,7 +1624,7 @@ static void AircraftEventHandler_Flying(Aircraft *v, const AirportFTAClass *apc)
 		 * if it is an airplane, look for LANDING, for helicopter HELILANDING
 		 * it is possible to choose from multiple landing runways, so loop until a free one is found */
 		byte landingtype = (v->subtype == AIR_HELICOPTER) ? HELILANDING : LANDING;
-		const AirportFTA *current = apc->layout[v->u.air.pos].next;
+		const AirportFTA *current = apc->layout[v->pos].next;
 		while (current != NULL) {
 			if (current->heading == landingtype) {
 				/* save speed before, since if AirportHasBlock is false, it resets them to 0
@@ -1633,12 +1633,12 @@ static void AircraftEventHandler_Flying(Aircraft *v, const AirportFTAClass *apc)
 				uint16 tcur_speed = v->cur_speed;
 				uint16 tsubspeed = v->subspeed;
 				if (!AirportHasBlock(v, current, apc)) {
-					v->u.air.state = landingtype; // LANDING / HELILANDING
+					v->state = landingtype; // LANDING / HELILANDING
 					/* it's a bit dirty, but I need to set position to next position, otherwise
 					 * if there are multiple runways, plane won't know which one it took (because
 					 * they all have heading LANDING). And also occupy that block! */
-					v->u.air.pos = current->next_position;
-					SETBITS(st->airport_flags, apc->layout[v->u.air.pos].block);
+					v->pos = current->next_position;
+					SETBITS(st->airport_flags, apc->layout[v->pos].block);
 					return;
 				}
 				v->cur_speed = tcur_speed;
@@ -1647,13 +1647,13 @@ static void AircraftEventHandler_Flying(Aircraft *v, const AirportFTAClass *apc)
 			current = current->next;
 		}
 	}
-	v->u.air.state = FLYING;
-	v->u.air.pos = apc->layout[v->u.air.pos].next_position;
+	v->state = FLYING;
+	v->pos = apc->layout[v->pos].next_position;
 }
 
 static void AircraftEventHandler_Landing(Aircraft *v, const AirportFTAClass *apc)
 {
-	v->u.air.state = ENDLANDING;
+	v->state = ENDLANDING;
 	AircraftLandAirplane(v);  // maybe crash airplane
 
 	/* check if the aircraft needs to be replaced or renewed and send it to a hangar if needed */
@@ -1666,14 +1666,14 @@ static void AircraftEventHandler_Landing(Aircraft *v, const AirportFTAClass *apc
 
 static void AircraftEventHandler_HeliLanding(Aircraft *v, const AirportFTAClass *apc)
 {
-	v->u.air.state = HELIENDLANDING;
+	v->state = HELIENDLANDING;
 	v->UpdateDeltaXY(INVALID_DIR);
 }
 
 static void AircraftEventHandler_EndLanding(Aircraft *v, const AirportFTAClass *apc)
 {
 	/* next block busy, don't do a thing, just wait */
-	if (AirportHasBlock(v, &apc->layout[v->u.air.pos], apc)) return;
+	if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
 
 	/* if going to terminal (OT_GOTO_STATION) choose one
 	 * 1. in case all terminals are busy AirportFindFreeTerminal() returns false or
@@ -1682,14 +1682,14 @@ static void AircraftEventHandler_EndLanding(Aircraft *v, const AirportFTAClass *
 	if (v->current_order.IsType(OT_GOTO_STATION)) {
 		if (AirportFindFreeTerminal(v, apc)) return;
 	}
-	v->u.air.state = HANGAR;
+	v->state = HANGAR;
 
 }
 
 static void AircraftEventHandler_HeliEndLanding(Aircraft *v, const AirportFTAClass *apc)
 {
 	/*  next block busy, don't do a thing, just wait */
-	if (AirportHasBlock(v, &apc->layout[v->u.air.pos], apc)) return;
+	if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
 
 	/* if going to helipad (OT_GOTO_STATION) choose one. If airport doesn't have helipads, choose terminal
 	 * 1. in case all terminals/helipads are busy (AirportFindFreeHelipad() returns false) or
@@ -1701,7 +1701,7 @@ static void AircraftEventHandler_HeliEndLanding(Aircraft *v, const AirportFTACla
 	if (v->current_order.IsType(OT_GOTO_STATION)) {
 		if (AirportFindFreeHelipad(v, apc)) return;
 	}
-	v->u.air.state = (apc->nof_depots != 0) ? HANGAR : HELITAKEOFF;
+	v->state = (apc->nof_depots != 0) ? HANGAR : HELITAKEOFF;
 }
 
 typedef void AircraftStateHandler(Aircraft *v, const AirportFTAClass *apc);
@@ -1734,10 +1734,10 @@ static AircraftStateHandler * const _aircraft_state_handlers[] = {
 static void AirportClearBlock(const Aircraft *v, const AirportFTAClass *apc)
 {
 	/* we have left the previous block, and entered the new one. Free the previous block */
-	if (apc->layout[v->u.air.previous_pos].block != apc->layout[v->u.air.pos].block) {
-		Station *st = Station::Get(v->u.air.targetairport);
+	if (apc->layout[v->previous_pos].block != apc->layout[v->pos].block) {
+		Station *st = Station::Get(v->targetairport);
 
-		CLRBITS(st->airport_flags, apc->layout[v->u.air.previous_pos].block);
+		CLRBITS(st->airport_flags, apc->layout[v->previous_pos].block);
 	}
 }
 
@@ -1746,7 +1746,7 @@ static void AirportGoToNextPosition(Aircraft *v)
 	/* if aircraft is not in position, wait until it is */
 	if (!AircraftController(v)) return;
 
-	const AirportFTAClass *apc = Station::Get(v->u.air.targetairport)->Airport();
+	const AirportFTAClass *apc = Station::Get(v->targetairport)->Airport();
 
 	AirportClearBlock(v, apc);
 	AirportMove(v, apc); // move aircraft to next position
@@ -1756,28 +1756,28 @@ static void AirportGoToNextPosition(Aircraft *v)
 static bool AirportMove(Aircraft *v, const AirportFTAClass *apc)
 {
 	/* error handling */
-	if (v->u.air.pos >= apc->nofelements) {
-		DEBUG(misc, 0, "[Ap] position %d is not valid for current airport. Max position is %d", v->u.air.pos, apc->nofelements-1);
-		assert(v->u.air.pos < apc->nofelements);
+	if (v->pos >= apc->nofelements) {
+		DEBUG(misc, 0, "[Ap] position %d is not valid for current airport. Max position is %d", v->pos, apc->nofelements-1);
+		assert(v->pos < apc->nofelements);
 	}
 
-	const AirportFTA *current = &apc->layout[v->u.air.pos];
+	const AirportFTA *current = &apc->layout[v->pos];
 	/* we have arrived in an important state (eg terminal, hangar, etc.) */
-	if (current->heading == v->u.air.state) {
-		byte prev_pos = v->u.air.pos; // location could be changed in state, so save it before-hand
-		byte prev_state = v->u.air.state;
-		_aircraft_state_handlers[v->u.air.state](v, apc);
-		if (v->u.air.state != FLYING) v->u.air.previous_pos = prev_pos;
-		if (v->u.air.state != prev_state || v->u.air.pos != prev_pos) UpdateAircraftCache(v);
+	if (current->heading == v->state) {
+		byte prev_pos = v->pos; // location could be changed in state, so save it before-hand
+		byte prev_state = v->state;
+		_aircraft_state_handlers[v->state](v, apc);
+		if (v->state != FLYING) v->previous_pos = prev_pos;
+		if (v->state != prev_state || v->pos != prev_pos) UpdateAircraftCache(v);
 		return true;
 	}
 
-	v->u.air.previous_pos = v->u.air.pos; // save previous location
+	v->previous_pos = v->pos; // save previous location
 
 	/* there is only one choice to move to */
 	if (current->next == NULL) {
 		if (AirportSetBlocks(v, current, apc)) {
-			v->u.air.pos = current->next_position;
+			v->pos = current->next_position;
 			UpdateAircraftCache(v);
 		} // move to next position
 		return false;
@@ -1786,9 +1786,9 @@ static bool AirportMove(Aircraft *v, const AirportFTAClass *apc)
 	/* there are more choices to choose from, choose the one that
 	 * matches our heading */
 	do {
-		if (v->u.air.state == current->heading || current->heading == TO_ALL) {
+		if (v->state == current->heading || current->heading == TO_ALL) {
 			if (AirportSetBlocks(v, current, apc)) {
-				v->u.air.pos = current->next_position;
+				v->pos = current->next_position;
 				UpdateAircraftCache(v);
 			} // move to next position
 			return false;
@@ -1796,7 +1796,7 @@ static bool AirportMove(Aircraft *v, const AirportFTAClass *apc)
 		current = current->next;
 	} while (current != NULL);
 
-	DEBUG(misc, 0, "[Ap] cannot move further on Airport! (pos %d state %d) for vehicle %d", v->u.air.pos, v->u.air.state, v->index);
+	DEBUG(misc, 0, "[Ap] cannot move further on Airport! (pos %d state %d) for vehicle %d", v->pos, v->state, v->index);
 	assert(0);
 	return false;
 }
@@ -1804,12 +1804,12 @@ static bool AirportMove(Aircraft *v, const AirportFTAClass *apc)
 /*  returns true if the road ahead is busy, eg. you must wait before proceeding */
 static bool AirportHasBlock(Aircraft *v, const AirportFTA *current_pos, const AirportFTAClass *apc)
 {
-	const AirportFTA *reference = &apc->layout[v->u.air.pos];
+	const AirportFTA *reference = &apc->layout[v->pos];
 	const AirportFTA *next = &apc->layout[current_pos->next_position];
 
 	/* same block, then of course we can move */
 	if (apc->layout[current_pos->position].block != next->block) {
-		const Station *st = Station::Get(v->u.air.targetairport);
+		const Station *st = Station::Get(v->targetairport);
 		uint64 airport_flags = next->block;
 
 		/* check additional possible extra blocks */
@@ -1836,7 +1836,7 @@ static bool AirportHasBlock(Aircraft *v, const AirportFTA *current_pos, const Ai
 static bool AirportSetBlocks(Aircraft *v, const AirportFTA *current_pos, const AirportFTAClass *apc)
 {
 	const AirportFTA *next = &apc->layout[current_pos->next_position];
-	const AirportFTA *reference = &apc->layout[v->u.air.pos];
+	const AirportFTA *reference = &apc->layout[v->pos];
 
 	/* if the next position is in another block, check it and wait until it is free */
 	if ((apc->layout[current_pos->position].block & next->block) != next->block) {
@@ -1857,7 +1857,7 @@ static bool AirportSetBlocks(Aircraft *v, const AirportFTA *current_pos, const A
 		 * checking, because it has been set by the airplane before */
 		if (current_pos->block == next->block) airport_flags ^= next->block;
 
-		Station *st = Station::Get(v->u.air.targetairport);
+		Station *st = Station::Get(v->targetairport);
 		if (HASBITS(st->airport_flags, airport_flags)) {
 			v->cur_speed = 0;
 			v->subspeed = 0;
@@ -1873,11 +1873,11 @@ static bool AirportSetBlocks(Aircraft *v, const AirportFTA *current_pos, const A
 
 static bool FreeTerminal(Aircraft *v, byte i, byte last_terminal)
 {
-	Station *st = Station::Get(v->u.air.targetairport);
+	Station *st = Station::Get(v->targetairport);
 	for (; i < last_terminal; i++) {
 		if (!HasBit(st->airport_flags, _airport_terminal_flag[i])) {
 			/* TERMINAL# HELIPAD# */
-			v->u.air.state = _airport_terminal_state[i]; // start moving to that terminal/helipad
+			v->state = _airport_terminal_state[i]; // start moving to that terminal/helipad
 			SetBit(st->airport_flags, _airport_terminal_flag[i]); // occupy terminal/helipad
 			return true;
 		}
@@ -1907,8 +1907,8 @@ static bool AirportFindFreeTerminal(Aircraft *v, const AirportFTAClass *apc)
 	 * fails, then attempt fails and plane waits
 	 */
 	if (apc->terminals[0] > 1) {
-		const Station *st = Station::Get(v->u.air.targetairport);
-		const AirportFTA *temp = apc->layout[v->u.air.pos].next;
+		const Station *st = Station::Get(v->targetairport);
+		const AirportFTA *temp = apc->layout[v->pos].next;
 
 		while (temp != NULL) {
 			if (temp->heading == 255) {
@@ -1958,8 +1958,8 @@ static bool AirportFindFreeHelipad(Aircraft *v, const AirportFTAClass *apc)
 
 	/* if there are more helicoptergroups, pick one, just as in AirportFindFreeTerminal() */
 	if (apc->helipads[0] > 1) {
-		const Station *st = Station::Get(v->u.air.targetairport);
-		const AirportFTA *temp = apc->layout[v->u.air.pos].next;
+		const Station *st = Station::Get(v->targetairport);
+		const AirportFTA *temp = apc->layout[v->pos].next;
 
 		while (temp != NULL) {
 			if (temp->heading == 255) {
@@ -2049,7 +2049,7 @@ bool Aircraft::Tick()
 }
 
 
-/** Returns aircraft's target station if v->u.air.target_airport
+/** Returns aircraft's target station if v->target_airport
  * is a valid station with airport.
  * @param v vehicle to get target airport for
  * @return pointer to target station, NULL if invalid
@@ -2058,7 +2058,7 @@ Station *GetTargetAirportIfValid(const Aircraft *v)
 {
 	assert(v->type == VEH_AIRCRAFT);
 
-	Station *st = Station::GetIfValid(v->u.air.targetairport);
+	Station *st = Station::GetIfValid(v->targetairport);
 	if (st == NULL) return NULL;
 
 	return st->airport_tile == INVALID_TILE ? NULL : st;
@@ -2077,12 +2077,12 @@ void UpdateAirplanesOnNewStation(const Station *st)
 	FOR_ALL_VEHICLES(u) {
 		if (u->type == VEH_AIRCRAFT && IsNormalAircraft(u)) {
 			Aircraft *v = (Aircraft *)u;
-			if (v->u.air.targetairport == st->index) { // if heading to this airport
+			if (v->targetairport == st->index) { // if heading to this airport
 				/* update position of airplane. If plane is not flying, landing, or taking off
 				 * you cannot delete airport, so it doesn't matter */
-				if (v->u.air.state >= FLYING) { // circle around
-					v->u.air.pos = v->u.air.previous_pos = AircraftGetEntryPoint(v, ap);
-					v->u.air.state = FLYING;
+				if (v->state >= FLYING) { // circle around
+					v->pos = v->previous_pos = AircraftGetEntryPoint(v, ap);
+					v->state = FLYING;
 					UpdateAircraftCache(v);
 					/* landing plane needs to be reset to flying height (only if in pause mode upgrade,
 					 * in normal mode, plane is reset in AircraftController. It doesn't hurt for FLYING */
@@ -2090,13 +2090,13 @@ void UpdateAirplanesOnNewStation(const Station *st)
 					/* set new position x,y,z */
 					SetAircraftPosition(v, gp.x, gp.y, GetAircraftFlyingAltitude(v));
 				} else {
-					assert(v->u.air.state == ENDTAKEOFF || v->u.air.state == HELITAKEOFF);
+					assert(v->state == ENDTAKEOFF || v->state == HELITAKEOFF);
 					byte takeofftype = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : ENDTAKEOFF;
 					/* search in airportdata for that heading
 					 * easiest to do, since this doesn't happen a lot */
 					for (uint cnt = 0; cnt < ap->nofelements; cnt++) {
 						if (ap->layout[cnt].heading == takeofftype) {
-							v->u.air.pos = ap->layout[cnt].position;
+							v->pos = ap->layout[cnt].position;
 							UpdateAircraftCache(v);
 							break;
 						}
diff --git a/src/newgrf_engine.cpp b/src/newgrf_engine.cpp
index a3bd84c2dd..993ff00f90 100644
--- a/src/newgrf_engine.cpp
+++ b/src/newgrf_engine.cpp
@@ -180,9 +180,9 @@ static byte MapAircraftMovementState(const Aircraft *v)
 	if (st == NULL) return AMS_TTDP_FLIGHT_TO_TOWER;
 
 	const AirportFTAClass *afc = st->Airport();
-	uint16 amdflag = afc->MovingData(v->u.air.pos)->flag;
+	uint16 amdflag = afc->MovingData(v->pos)->flag;
 
-	switch (v->u.air.state) {
+	switch (v->state) {
 		case HANGAR:
 			/* The international airport is a special case as helicopters can land in
 			 * front of the hanger. Helicopters also change their air.state to
@@ -303,7 +303,7 @@ enum {
  */
 static byte MapAircraftMovementAction(const Aircraft *v)
 {
-	switch (v->u.air.state) {
+	switch (v->state) {
 		case HANGAR:
 			return (v->cur_speed > 0) ? AMA_TTDP_LANDING_TO_HANGAR : AMA_TTDP_IN_HANGAR;
 
@@ -796,7 +796,7 @@ static uint32 VehicleGetVariable(const ResolverObject *object, byte variable, by
 			Aircraft *a = (Aircraft *)v;
 			switch (variable - 0x80) {
 				case 0x62: return MapAircraftMovementState(a);  // Current movement state
-				case 0x63: return v->u.air.targetairport;       // Airport to which the action refers
+				case 0x63: return a->targetairport;             // Airport to which the action refers
 				case 0x66: return MapAircraftMovementAction(a); // Current movement action
 			}
 		} break;
@@ -936,7 +936,7 @@ SpriteID GetRotorOverrideSprite(EngineID engine, const Aircraft *v, bool info_vi
 
 	if (v == NULL) return group->g.result.sprite;
 
-	return group->g.result.sprite + (info_view ? 0 : (v->Next()->Next()->u.air.state % group->g.result.num_sprites));
+	return group->g.result.sprite + (info_view ? 0 : (v->Next()->Next()->state % group->g.result.num_sprites));
 }
 
 
diff --git a/src/openttd.cpp b/src/openttd.cpp
index ba4a96cce1..e22cbea018 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -1146,9 +1146,9 @@ void StateGameLoop()
 
 					case VEH_AIRCRAFT: {
 						Aircraft *a = (Aircraft *)v;
-						uint speed = a->u.air.cached_max_speed;
+						uint speed = a->cached_max_speed;
 						UpdateAircraftCache(a);
-						if (speed != a->u.air.cached_max_speed) {
+						if (speed != a->cached_max_speed) {
 							DEBUG(desync, 2, "cache mismatch: vehicle %i, company %i, unit number %i\n", v->index, (int)v->owner, v->unitnumber);
 						}
 					} break;
diff --git a/src/order_cmd.cpp b/src/order_cmd.cpp
index cf527e39a2..3dfe2a1ebc 100644
--- a/src/order_cmd.cpp
+++ b/src/order_cmd.cpp
@@ -1620,10 +1620,13 @@ bool UpdateOrderDest(Vehicle *v, const Order *order, int conditional_depth)
 					/* If there is no depot in front, reverse automatically (trains only) */
 					if (v->type == VEH_TRAIN && reverse) DoCommand(v->tile, v->index, 0, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
 
-					if (v->type == VEH_AIRCRAFT && v->u.air.state == FLYING && v->u.air.targetairport != destination) {
-						/* The aircraft is now heading for a different hangar than the next in the orders */
-						extern void AircraftNextAirportPos_and_Order(Aircraft *a);
-						AircraftNextAirportPos_and_Order((Aircraft *)v);
+					if (v->type == VEH_AIRCRAFT) {
+						Aircraft *a = (Aircraft *)v;
+						if (a->state == FLYING && a->targetairport != destination) {
+							/* The aircraft is now heading for a different hangar than the next in the orders */
+							extern void AircraftNextAirportPos_and_Order(Aircraft *a);
+							AircraftNextAirportPos_and_Order(a);
+						}
 					}
 				} else {
 					UpdateVehicleTimetable(v, true);
diff --git a/src/saveload/oldloader_sl.cpp b/src/saveload/oldloader_sl.cpp
index eaa488fa1e..d1186559c8 100644
--- a/src/saveload/oldloader_sl.cpp
+++ b/src/saveload/oldloader_sl.cpp
@@ -1111,10 +1111,10 @@ static const OldChunks vehicle_ship_chunk[] = {
 };
 
 static const OldChunks vehicle_air_chunk[] = {
-	OCL_SVAR(  OC_UINT8, VehicleAir, pos ),
-	OCL_SVAR(  OC_FILE_U8 | OC_VAR_U16, VehicleAir, targetairport ),
-	OCL_SVAR( OC_UINT16, VehicleAir, crashed_counter ),
-	OCL_SVAR(  OC_UINT8, VehicleAir, state ),
+	OCL_SVAR(  OC_UINT8, Aircraft, pos ),
+	OCL_SVAR(  OC_FILE_U8 | OC_VAR_U16, Aircraft, targetairport ),
+	OCL_SVAR( OC_UINT16, Aircraft, crashed_counter ),
+	OCL_SVAR(  OC_UINT8, Aircraft, state ),
 
 	OCL_NULL( 5 ), ///< Junk
 
@@ -1159,7 +1159,7 @@ static bool LoadOldVehicleUnion(LoadgameState *ls, int num)
 			case VEH_TRAIN   : res = LoadChunk(ls, &v->u.rail,     vehicle_train_chunk);    break;
 			case VEH_ROAD    : res = LoadChunk(ls, &v->u.road,     vehicle_road_chunk);     break;
 			case VEH_SHIP    : res = LoadChunk(ls, v, vehicle_ship_chunk);     break;
-			case VEH_AIRCRAFT: res = LoadChunk(ls, &v->u.air,      vehicle_air_chunk);      break;
+			case VEH_AIRCRAFT: res = LoadChunk(ls, v, vehicle_air_chunk);      break;
 			case VEH_EFFECT  : res = LoadChunk(ls, v, vehicle_effect_chunk);   break;
 			case VEH_DISASTER: res = LoadChunk(ls, v, vehicle_disaster_chunk); break;
 		}
diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
index 727b2d35b2..d7e2c136db 100644
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -173,29 +173,30 @@ void UpdateOldAircraft()
 		 * skip those */
 		if (v->type == VEH_AIRCRAFT && IsNormalAircraft(v)) {
 			Aircraft *v_oldstyle = (Aircraft *)v;
+			Aircraft *a = (Aircraft *)v_oldstyle;
 			/* airplane in terminal stopped doesn't hurt anyone, so goto next */
-			if (v_oldstyle->vehstatus & VS_STOPPED && v_oldstyle->u.air.state == 0) {
-				v_oldstyle->u.air.state = HANGAR;
+			if (a->vehstatus & VS_STOPPED && a->state == 0) {
+				a->state = HANGAR;
 				continue;
 			}
 
-			AircraftLeaveHangar(v_oldstyle); // make airplane visible if it was in a depot for example
-			v_oldstyle->vehstatus &= ~VS_STOPPED; // make airplane moving
-			v_oldstyle->cur_speed = v_oldstyle->max_speed; // so aircraft don't have zero speed while in air
-			if (!v_oldstyle->current_order.IsType(OT_GOTO_STATION) && !v_oldstyle->current_order.IsType(OT_GOTO_DEPOT)) {
+			AircraftLeaveHangar(a); // make airplane visible if it was in a depot for example
+			a->vehstatus &= ~VS_STOPPED; // make airplane moving
+			a->cur_speed = v_oldstyle->max_speed; // so aircraft don't have zero speed while in air
+			if (!a->current_order.IsType(OT_GOTO_STATION) && !a->current_order.IsType(OT_GOTO_DEPOT)) {
 				/* reset current order so aircraft doesn't have invalid "station-only" order */
-				v_oldstyle->current_order.MakeDummy();
+				a->current_order.MakeDummy();
 			}
-			v_oldstyle->u.air.state = FLYING;
-			AircraftNextAirportPos_and_Order(v_oldstyle); // move it to the entry point of the airport
-			GetNewVehiclePosResult gp = GetNewVehiclePos(v_oldstyle);
-			v_oldstyle->tile = 0; // aircraft in air is tile=0
+			a->state = FLYING;
+			AircraftNextAirportPos_and_Order(a); // move it to the entry point of the airport
+			GetNewVehiclePosResult gp = GetNewVehiclePos(a);
+			a->tile = 0; // aircraft in air is tile=0
 
 			/* correct speed of helicopter-rotors */
-			if (v_oldstyle->subtype == AIR_HELICOPTER) v_oldstyle->Next()->Next()->cur_speed = 32;
+			if (a->subtype == AIR_HELICOPTER) a->Next()->Next()->cur_speed = 32;
 
 			/* set new position x,y,z */
-			SetAircraftPosition(v_oldstyle, gp.x, gp.y, GetAircraftFlyingAltitude(v_oldstyle));
+			SetAircraftPosition(a, gp.x, gp.y, GetAircraftFlyingAltitude(a));
 		}
 	}
 }
@@ -572,15 +573,15 @@ const SaveLoad *GetVehicleDescription(VehicleType vt)
 	static const SaveLoad _aircraft_desc[] = {
 		SLE_WRITEBYTE(Vehicle, type, VEH_AIRCRAFT),
 		SLE_VEH_INCLUDEX(),
-		    SLE_VARX(cpp_offsetof(Vehicle, u) + cpp_offsetof(VehicleAir, crashed_counter),       SLE_UINT16),
-		    SLE_VARX(cpp_offsetof(Vehicle, u) + cpp_offsetof(VehicleAir, pos),                   SLE_UINT8),
+		     SLE_VAR(Aircraft, crashed_counter,       SLE_UINT16),
+		     SLE_VAR(Aircraft, pos,                   SLE_UINT8),
 
-		SLE_CONDVARX(cpp_offsetof(Vehicle, u) + cpp_offsetof(VehicleAir, targetairport),         SLE_FILE_U8  | SLE_VAR_U16,   0, 4),
-		SLE_CONDVARX(cpp_offsetof(Vehicle, u) + cpp_offsetof(VehicleAir, targetairport),         SLE_UINT16,                   5, SL_MAX_VERSION),
+		 SLE_CONDVAR(Aircraft, targetairport,         SLE_FILE_U8  | SLE_VAR_U16,   0, 4),
+		 SLE_CONDVAR(Aircraft, targetairport,         SLE_UINT16,                   5, SL_MAX_VERSION),
 
-		    SLE_VARX(cpp_offsetof(Vehicle, u) + cpp_offsetof(VehicleAir, state),                 SLE_UINT8),
+		     SLE_VAR(Aircraft, state,                 SLE_UINT8),
 
-		SLE_CONDVARX(cpp_offsetof(Vehicle, u) + cpp_offsetof(VehicleAir, previous_pos),          SLE_UINT8,                    2, SL_MAX_VERSION),
+		 SLE_CONDVAR(Aircraft, previous_pos,          SLE_UINT8,                    2, SL_MAX_VERSION),
 
 		/* reserve extra space in savegame here. (currently 15 bytes) */
 		SLE_CONDNULL(15,                                                           2, SL_MAX_VERSION),
diff --git a/src/station.cpp b/src/station.cpp
index 03d7a9db80..97713dfbf3 100644
--- a/src/station.cpp
+++ b/src/station.cpp
@@ -70,9 +70,10 @@ Station::~Station()
 
 	Vehicle *v;
 	FOR_ALL_VEHICLES(v) {
-		if (v->type == VEH_AIRCRAFT && IsNormalAircraft(v) && v->u.air.targetairport == this->index) {
-			v->u.air.targetairport = INVALID_STATION;
-		}
+		if (v->type != VEH_AIRCRAFT || !IsNormalAircraft(v)) continue;
+
+		Aircraft *a = (Aircraft *)v;
+		if (a->targetairport == this->index) a->targetairport = INVALID_STATION;
 	}
 
 	MarkDirty();
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index 14718a45dd..8076b95a28 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -1968,7 +1968,8 @@ static CommandCost RemoveAirport(Station *st, DoCommandFlag flags)
 	FOR_ALL_VEHICLES(v) {
 		if (!(v->type == VEH_AIRCRAFT && IsNormalAircraft(v))) continue;
 
-		if (v->u.air.targetairport == st->index && v->u.air.state != FLYING) return CMD_ERROR;
+		Aircraft *a = (Aircraft *)v;
+		if (a->targetairport == st->index && a->state != FLYING) return CMD_ERROR;
 	}
 
 	BEGIN_TILE_LOOP(tile_cur, w, h, tile) {
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index 28d026feb5..857c4df8ab 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -530,7 +530,7 @@ void Vehicle::PreDestructor()
 		Station *st = GetTargetAirportIfValid(a);
 		if (st != NULL) {
 			const AirportFTA *layout = st->Airport()->layout;
-			CLRBITS(st->airport_flags, layout[this->u.air.previous_pos].block | layout[this->u.air.pos].block);
+			CLRBITS(st->airport_flags, layout[a->previous_pos].block | layout[a->pos].block);
 		}
 	}
 
@@ -1571,10 +1571,13 @@ CommandCost Vehicle::SendToDepot(DoCommandFlag flags, DepotCommand command)
 		/* If there is no depot in front, reverse automatically (trains only) */
 		if (this->type == VEH_TRAIN && reverse) DoCommand(this->tile, this->index, 0, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
 
-		if (this->type == VEH_AIRCRAFT && this->u.air.state == FLYING && this->u.air.targetairport != destination) {
-			/* The aircraft is now heading for a different hangar than the next in the orders */
-			extern void AircraftNextAirportPos_and_Order(Aircraft *a);
-			AircraftNextAirportPos_and_Order((Aircraft *)this);
+		if (this->type == VEH_AIRCRAFT) {
+			Aircraft *a = (Aircraft *)this;
+			if (a->state == FLYING && a->targetairport != destination) {
+				/* The aircraft is now heading for a different hangar than the next in the orders */
+				extern void AircraftNextAirportPos_and_Order(Aircraft *a);
+				AircraftNextAirportPos_and_Order(a);
+			}
 		}
 	}
 
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index 9434cd5968..4719dd7af1 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -149,15 +149,6 @@ enum VehicleRailFlags {
 	VRF_TRAIN_STUCK    = 8,
 };
 
-struct VehicleAir {
-	uint16 crashed_counter;
-	uint16 cached_max_speed;
-	byte pos;
-	byte previous_pos;
-	StationID targetairport;
-	byte state;
-};
-
 struct VehicleRoad {
 	byte state;             ///< @see RoadVehicleStates
 	byte frame;
@@ -304,7 +295,6 @@ public:
 
 	union {
 		VehicleRail rail;
-		VehicleAir air;
 		VehicleRoad road;
 	} u;
 
diff --git a/src/vehicle_cmd.cpp b/src/vehicle_cmd.cpp
index 5a78c747cd..6dd38a3464 100644
--- a/src/vehicle_cmd.cpp
+++ b/src/vehicle_cmd.cpp
@@ -10,6 +10,7 @@
 #include "company_func.h"
 #include "vehicle_gui.h"
 #include "train.h"
+#include "aircraft.h"
 #include "newgrf_engine.h"
 #include "newgrf_text.h"
 #include "functions.h"
@@ -73,10 +74,11 @@ CommandCost CmdStartStopVehicle(TileIndex tile, DoCommandFlag flags, uint32 p1,
 		case VEH_ROAD:
 			break;
 
-		case VEH_AIRCRAFT:
+		case VEH_AIRCRAFT: {
+			Aircraft *a = (Aircraft *)v;
 			/* cannot stop airplane when in flight, or when taking off / landing */
-			if (v->u.air.state >= STARTTAKEOFF && v->u.air.state < TERM7) return_cmd_error(STR_ERROR_AIRCRAFT_IS_IN_FLIGHT);
-			break;
+			if (a->state >= STARTTAKEOFF && a->state < TERM7) return_cmd_error(STR_ERROR_AIRCRAFT_IS_IN_FLIGHT);
+		} break;
 
 		default: return CMD_ERROR;
 	}
diff --git a/src/water_cmd.cpp b/src/water_cmd.cpp
index b4a67024ac..48f4bdb764 100644
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -828,7 +828,7 @@ static void FloodVehicle(Vehicle *v)
 
 				case VEH_AIRCRAFT:
 					pass += 2; // driver
-					v->u.air.crashed_counter = 9000; // max 10000, disappear pretty fast
+					((Aircraft *)v)->crashed_counter = 9000; // max 10000, disappear pretty fast
 					InvalidateWindowClassesData(WC_AIRCRAFT_LIST, 0);
 					break;
 			}