public ActionResult AddCheckout(AddCheckoutViewModel viewModel)
        {
            PilotCheckout checkout = new PilotCheckout();

            checkout.AircraftId   = viewModel.AircraftId;
            checkout.PilotId      = viewModel.PilotId;
            checkout.InstructorId = viewModel.InstructorId;
            checkout.CheckoutDate = viewModel.CheckoutDate;

            _dataService.AddCheckout(checkout);

            return(PilotReview(viewModel.PilotId));
        }