order_cmd.diff

--- a/src/order_cmd.cpp
+++ b/src/order_cmd.cpp
@@ -1780,6 +1780,7 @@ void CheckOrders(const Vehicle *v)

                /* Check the order list */
                int n_st = 0;
+               bool has_accessible_depot = v->type != VEH_AIRCRAFT;

                FOR_VEHICLE_ORDERS(v, order) {
                        /* Dummy order? */
@@ -1802,6 +1803,8 @@ void CheckOrders(const Vehicle *v)
                                                        message == INVALID_STRING_ID) {
                                        message = STR_NEWS_PLANE_USES_TOO_SHORT_RUNWAY;
                                }
+
+                               if (v->type == VEH_AIRCRAFT && st->airport.HasHangar()) has_accessible_depot = true;
                        }
                }

@@ -1817,6 +1820,8 @@ void CheckOrders(const Vehicle *v)
                /* Do we only have 1 station in our order list? */
                if (n_st < 2 && message == INVALID_STRING_ID) message = STR_NEWS_VEHICLE_HAS_TOO_FEW_ORDERS;

+               if (!has_accessible_depot && message == INVALID_STRING_ID) message = STR_NEWS_VEHICLE_CAN_NOT_BE_SERVICED_ANYWHERE; /// TODO: add string to english.txt
+
 #ifndef NDEBUG
                if (v->orders.list != NULL) v->orders.list->DebugCheckSanity();
 #endif