(svn r19331) -Fix: when deleting an airport the size from the AirportSpec was used instead of the stored airport size

-Fix (r19319): detecting if a plane was landed at an airport failed
-Fix: reset the airporttile mapping when restarting a game

src/newgrf_airporttiles.h

@@ -15,7 +15,6 @@
 #include "airport.h"
 #include "station_map.h"
 #include "newgrf_commons.h"
-#include "airport.h"
 
 /** Animation triggers for airport tiles */
 enum AirpAnimationTrigger {