diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -165,7 +165,7 @@ void UpdateOldAircraft()
 	/* set airport_flags to 0 for all airports just to be sure */
 	Station *st;
 	FOR_ALL_STATIONS(st) {
-		st->airport_flags = 0; // reset airport
+		st->airport.flags = 0; // reset airport
 	}
 
 	Aircraft *a;