(svn r19457) -Codechange: introduce AirportOverrideManager to keep track of airports if a newgrf can't be found

src/openttd.cpp

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