Fix #11785, cf16f45: when bumping aircraft into the air, remove them from the loading vehicle list again

src/saveload/vehicle_sl.cpp

@@ -198,6 +198,18 @@ void UpdateOldAircraft()
 			SetAircraftPosition(a, gp.x, gp.y, GetAircraftFlightLevel(a));
 		}
 	}
+
+	/* Clear aircraft from loading vehicles, if we bumped them into the air. */
+	for (Station *st : Station::Iterate()) {
+		for (auto iter = st->loading_vehicles.begin(); iter != st->loading_vehicles.end(); /* nothing */) {
+			Vehicle *v = *iter;
+			if (v->type == VEH_AIRCRAFT && !v->current_order.IsType(OT_LOADING)) {
+				iter = st->loading_vehicles.erase(iter);
+			} else {
+				++iter;
+			}
+		}
+	}
 }
 
 /**