void SaveCompanyExecute()
        {
            //patch
            Company.Airports = AllAirports.Select(i => i.Airport).ToList();
            Company.Planes   = AllPlanes.Select(i => i.Plane).ToList();
            Company.Hubs     = Hubs.Select(i => i.GetSavableHub()).ToList();

            //Read from file
            string json = Newtonsoft.Json.JsonConvert.SerializeObject(Company);

            System.IO.File.WriteAllText(DataFile, json);
        }