public async Task <ActionResult <List <Flight> > > GetFlightsByLandingDate([FromBody] DateTime date)
{
FlightsCenterSystem.GetInstance().login(GetLoginToken().Name, GetLoginToken().Password,
out LoginToken <Object> l, out FacadeBase f);
facade = f as LoggedInAirlineFacade;
var result = await Task.Run(() => facade.GetFlightsByLandingDate(date));
return(StatusCode(200, result));
}