internal bool IsCurrentPlane(ICurrentPlane logicStation, string flightNumber)
 {
     if (logicStation.CurrentPlane == null)
     {
         return(false);
     }
     return(logicStation.CurrentPlane.FlightNumber == flightNumber);
 }
 internal bool HasCurrentPlane(ICurrentPlane logicStation)
 {
     return(logicStation.CurrentPlane != null);
 }