--- a/src/aircraft.h	Sat Apr 05 11:35:32 2008 +0000
+++ b/src/aircraft.h	Sat Apr 05 12:01:34 2008 +0000
@@ -126,6 +126,7 @@
 	bool IsInDepot() const { return (this->vehstatus & VS_HIDDEN) != 0 && IsHangarTile(this->tile); }
 	void Tick();
 	void OnNewDay();
+	TileIndex GetOrderStationLocation(StationID station);
 };
 
 #endif /* AIRCRAFT_H */

--- a/src/aircraft_cmd.cpp	Sat Apr 05 11:35:32 2008 +0000
+++ b/src/aircraft_cmd.cpp	Sat Apr 05 12:01:34 2008 +0000
@@ -1361,74 +1361,48 @@
 	}
 }
 
-static void ProcessAircraftOrder(Vehicle *v)
+void HandleMissingAircraftOrders(Vehicle *v)
 {
-	switch (v->current_order.type) {
-		case OT_GOTO_DEPOT:
-			if (!(v->current_order.flags & OFB_PART_OF_ORDERS)) return;
-			if (v->current_order.flags & OFB_SERVICE_IF_NEEDED &&
-					!VehicleNeedsService(v)) {
-				UpdateVehicleTimetable(v, true);
-				v->cur_order_index++;
-			}
-			break;
+	/*
+	 * We do not have an order. This can be divided into two cases:
+	 * 1) we are heading to an invalid station. In this case we must
+	 *    find another airport to go to. If there is nowhere to go,
+	 *    we will destroy the aircraft as it otherwise will enter
+	 *    the holding pattern for the first airport, which can cause
+	 *    the plane to go into an undefined state when building an
+	 *    airport with the same StationID.
+	 * 2) we are (still) heading to a (still) valid airport, then we
+	 *    can continue going there. This can happen when you are
+	 *    changing the aircraft's orders while in-flight or in for
+	 *    example a depot. However, when we have a current order to
+	 *    go to a depot, we have to keep that order so the aircraft
+	 *    actually stops.
+	 */
+	const Station *st = GetStation(v->u.air.targetairport);
+	if (!st->IsValid() || st->airport_tile == 0) {
+		CommandCost ret;
+		PlayerID old_player = _current_player;
 
-		case OT_LOADING: return;
+		_current_player = v->owner;
+		ret = DoCommand(v->tile, v->index, 0, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
+		_current_player = old_player;
 
-		default: break;
+		if (CmdFailed(ret)) CrashAirplane(v);
+	} else if (v->current_order.type != OT_GOTO_DEPOT) {
+		v->current_order.Free();
+	}
+}
+
+
+TileIndex Aircraft::GetOrderStationLocation(StationID station)
+{
+	/* Orders are changed in flight, ensure going to the right station. */
+	if (this->u.air.state == FLYING) {
+		AircraftNextAirportPos_and_Order(this);
 	}
 
-	if (v->cur_order_index >= v->num_orders) v->cur_order_index = 0;
-
-	const Order *order = GetVehicleOrder(v, v->cur_order_index);
-
-	if (order == NULL|| (order->type == OT_DUMMY && !CheckForValidOrders(v))) {
-		/*
-		 * We do not have an order. This can be divided into two cases:
-		 * 1) we are heading to an invalid station. In this case we must
-		 *    find another airport to go to. If there is nowhere to go,
-		 *    we will destroy the aircraft as it otherwise will enter
-		 *    the holding pattern for the first airport, which can cause
-		 *    the plane to go into an undefined state when building an
-		 *    airport with the same StationID.
-		 * 2) we are (still) heading to a (still) valid airport, then we
-		 *    can continue going there. This can happen when you are
-		 *    changing the aircraft's orders while in-flight or in for
-		 *    example a depot. However, when we have a current order to
-		 *    go to a depot, we have to keep that order so the aircraft
-		 *    actually stops.
-		 */
-		const Station *st = GetStation(v->u.air.targetairport);
-		if (!st->IsValid() || st->airport_tile == 0) {
-			CommandCost ret;
-			PlayerID old_player = _current_player;
-
-			_current_player = v->owner;
-			ret = DoCommand(v->tile, v->index, 0, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
-			_current_player = old_player;
-
-			if (CmdFailed(ret)) CrashAirplane(v);
-		} else if (v->current_order.type != OT_GOTO_DEPOT) {
-			v->current_order.Free();
-		}
-		return;
-	}
-
-	if (order->type  == v->current_order.type  &&
-			order->flags == v->current_order.flags &&
-			order->dest  == v->current_order.dest)
-		return;
-
-	v->current_order = *order;
-
-	/* orders are changed in flight, ensure going to the right station */
-	if (order->type == OT_GOTO_STATION && v->u.air.state == FLYING) {
-		AircraftNextAirportPos_and_Order(v);
-	}
-
-	InvalidateVehicleOrder(v);
-
-	InvalidateWindowClasses(WC_AIRCRAFT_LIST);
+	/* Aircraft do not use dest-tile */
+	return 0;
 }
 
 void Aircraft::MarkDirty()
@@ -2149,7 +2123,7 @@
 	}
 
 	HandleAircraftSmoke(v);
-	ProcessAircraftOrder(v);
+	ProcessOrders(v);
 	v->HandleLoading(loop != 0);
 
 	if (v->current_order.type >= OT_LOADING) return;

--- a/src/order_cmd.cpp	Sat Apr 05 11:35:32 2008 +0000
+++ b/src/order_cmd.cpp	Sat Apr 05 12:01:34 2008 +0000
@@ -1278,6 +1278,22 @@
 }
 
 /**
+ *
+ * Check if a vehicle has any valid orders
+ *
+ * @return false if there are no valid orders
+ *
+ */
+static bool CheckForValidOrders(const Vehicle *v)
+{
+	const Order *order;
+
+	FOR_VEHICLE_ORDERS(v, order) if (order->type != OT_DUMMY) return true;
+
+	return false;
+}
+
+/**
  * Handle the orders of a vehicle and determine the next place
  * to go to if needed.
  * @param v the vehicle to do this for.
@@ -1298,8 +1314,11 @@
 			break;
 
 		case OT_LOADING:
+			return false;
+
 		case OT_LEAVESTATION:
-			return false;
+			if (v->type != VEH_AIRCRAFT) return false;
+			break;
 
 		default: break;
 	}
@@ -1334,7 +1353,14 @@
 	const Order *order = GetVehicleOrder(v, v->cur_order_index);
 
 	/* If no order, do nothing. */
-	if (order == NULL) {
+	if (order == NULL || (v->type == VEH_AIRCRAFT && order->type == OT_DUMMY && !CheckForValidOrders(v))) {
+		if (v->type == VEH_AIRCRAFT) {
+			/* Aircraft do something vastly different here, so handle separately */
+			extern void HandleMissingAircraftOrders(Vehicle *v);
+			HandleMissingAircraftOrders(v);
+			return false;
+		}
+
 		v->current_order.Free();
 		v->dest_tile = 0;
 		if (v->type == VEH_ROAD) ClearSlot(v);
@@ -1361,6 +1387,7 @@
 		case VEH_TRAIN:
 			break;
 
+		case VEH_AIRCRAFT:
 		case VEH_SHIP:
 			InvalidateWindowClasses(v->GetVehicleListWindowClass());
 			break;
@@ -1368,14 +1395,11 @@
 
 	switch (order->type) {
 		case OT_GOTO_STATION:
-			if (order->dest == v->last_station_visited) {
-				v->last_station_visited = INVALID_STATION;
-			}
 			v->dest_tile = v->GetOrderStationLocation(order->dest);
 			break;
 
 		case OT_GOTO_DEPOT:
-			v->dest_tile = GetDepot(order->dest)->xy;
+			if (v->type != VEH_AIRCRAFT) v->dest_tile = GetDepot(order->dest)->xy;
 			break;
 
 		case OT_GOTO_WAYPOINT:
@@ -1390,22 +1414,6 @@
 	return may_reverse;
 }
 
-/**
- *
- * Check if a vehicle has any valid orders
- *
- * @return false if there are no valid orders
- *
- */
-bool CheckForValidOrders(const Vehicle* v)
-{
-	const Order *order;
-
-	FOR_VEHICLE_ORDERS(v, order) if (order->type != OT_DUMMY) return true;
-
-	return false;
-}
-
 void InitializeOrders()
 {
 	_Order_pool.CleanPool();

--- a/src/order_func.h	Sat Apr 05 11:35:32 2008 +0000
+++ b/src/order_func.h	Sat Apr 05 12:01:34 2008 +0000
@@ -35,7 +35,6 @@
 bool VehicleHasDepotOrders(const Vehicle *v);
 void CheckOrders(const Vehicle*);
 void DeleteVehicleOrders(Vehicle *v);
-bool CheckForValidOrders(const Vehicle* v);
 bool ProcessOrders(Vehicle *v);
 
 #define MIN_SERVINT_PERCENT  5

--- a/src/roadveh_cmd.cpp	Sat Apr 05 11:35:32 2008 +0000
+++ b/src/roadveh_cmd.cpp	Sat Apr 05 12:01:34 2008 +0000
@@ -756,8 +756,9 @@
 
 TileIndex RoadVehicle::GetOrderStationLocation(StationID station)
 {
+	if (station == this->last_station_visited) this->last_station_visited = INVALID_STATION;
+
 	TileIndex dest = INVALID_TILE;
-
 	const RoadStop *rs = GetStation(station)->GetPrimaryRoadStop(this);
 	if (rs != NULL) {
 		uint mindist = MAX_UVALUE(uint);

--- a/src/ship_cmd.cpp	Sat Apr 05 11:35:32 2008 +0000
+++ b/src/ship_cmd.cpp	Sat Apr 05 12:01:34 2008 +0000
@@ -244,6 +244,8 @@
 
 TileIndex Ship::GetOrderStationLocation(StationID station)
 {
+	if (station == this->last_station_visited) this->last_station_visited = INVALID_STATION;
+
 	Station *st = GetStation(station);
 	if (st->dock_tile != 0) {
 		return TILE_ADD(st->dock_tile, ToTileIndexDiff(GetDockOffset(st->dock_tile)));

--- a/src/train_cmd.cpp	Sat Apr 05 11:35:32 2008 +0000
+++ b/src/train_cmd.cpp	Sat Apr 05 12:01:34 2008 +0000
@@ -2617,6 +2617,8 @@
 
 TileIndex Train::GetOrderStationLocation(StationID station)
 {
+	if (station == this->last_station_visited) this->last_station_visited = INVALID_STATION;
+
 	return GetStation(station)->xy;
 }