Planes despawn

[salmo]

    public override void OnAircraftLanded(int missionNumber, string shortName, AiAircraft aircraft)
    {
        base.OnAircraftLanded(missionNumber, shortName, aircraft);

        double DespawnAfter = 5 * 60;   // seconds after landing
        Timeout(DespawnAfter, () =>     // despawn after specified seconds
        {
            try { aircraft.Destroy(); }
            catch { }
        });
    }