(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/openttd.cpp

@@ -313,6 +313,7 @@ static void InitializeDynamicVariables()
 	_house_mngr.ResetMapping();
 	_industry_mngr.ResetMapping();
 	_industile_mngr.ResetMapping();
+	_airporttile_mngr.ResetMapping();
 }