bool AddToTrafficList(TowerPlaneRec* t, bool holding = false);
bool AddToCircuitList(TowerPlaneRec* t);
+
+ // Add to vacated list only if not already present
+ void AddToVacatedList(TowerPlaneRec* t);
// Ground can be separate or handled by tower in real life.
// In the program we will always use a separate FGGround class, but we need to know