private void FlightDirector_Aircraft_Landed(object sender, AircraftLandedEventArgs e)
{
AirplaneManager.RemoveAircraft(e.Aircraft);
AircraftLanded?.Invoke(this, e);
}
private void OnAircraftLanded(Aircraft ac)
{
AircraftLanded?.Invoke(this, new AircraftLandedEventArgs(ac));
}