(svn r19325) -Codechange: introduce airport classes and split the default airports in 4 classes

src/newgrf.cpp

@@ -5907,6 +5907,7 @@ static void ResetNewGRFData()
 	ResetCustomStations();
 
 	/* Reset airport-related structures */
+	ResetAirportClasses();
 	ResetCustomAirports();
 	AirportSpec::ResetAirports();
 	AirportTileSpec::ResetAirportTiles();
@@ -6633,6 +6634,7 @@ static void AfterLoadGRFs()
 
 	/* Add all new airports to the airports array. */
 	FinaliseAirportsArray();
+	BindAirportSpecs();
 
 	/* Update the townname generators list */
 	InitGRFTownGeneratorNames();