(svn r20374) -Codechange: add persistant storage for airports

src/station_base.h

@@ -17,6 +17,7 @@
 #include "newgrf_airport.h"
 #include "cargopacket.h"
 #include "industry_type.h"
+#include "newgrf_storage.h"
 
 typedef Pool<BaseStation, StationID, 32, 64000> StationPool;
 extern StationPool _station_pool;
@@ -47,12 +48,15 @@ struct GoodsEntry {
 
 /** All airport-related information. Only valid if tile != INVALID_TILE. */
 struct Airport : public TileArea {
+	typedef PersistentStorageArray<int32, 16> PersistentStorage;
+
 	Airport() : TileArea(INVALID_TILE, 0, 0) {}
 
 	uint64 flags;       ///< stores which blocks on the airport are taken. was 16 bit earlier on, then 32
 	byte type;          ///< Type of this airport, @see AirportTypes.
 	byte layout;        ///< Airport layout number.
 	Direction rotation; ///< How this airport is rotated.
+	PersistentStorage psa; ///< Persistent storage for NewGRF airports
 
 	/**
 	 * Get the AirportSpec that from the airport type of this airport. If there