public bool TryAirlineLogin(string userName, string password, out LoginToken <AirlineCompany> token)
        {
            _arilineDAO = new AirlineDAOMSSQL();
            AirlineCompany airline = _arilineDAO.GetAirlineByUsername(userName);

            if (airline != null)
            {
                if (airline.PASSWORD == password)
                {
                    token = new LoginToken <AirlineCompany>()
                    {
                        User = airline
                    };
                    return(true);
                }
                else
                {
                    throw new WrongPasswordException("Wrong password exception");
                }
            }
            token = null;
            return(false);
        }
        public bool TryCustomerLogin(string userName, string password, out LoginToken <Customer> token)
        {
            _customerDAO = new CustomerDAOMSSQL();
            Customer customer = _customerDAO.GetCustomerByUsername(userName);

            if (customer != null)
            {
                if (customer.PASSWORD == password)
                {
                    token = new LoginToken <Customer>()
                    {
                        User = customer
                    };
                    return(true);
                }
                else
                {
                    throw new WrongPasswordException("Wrong Password Exception");
                }
            }
            token = null;
            return(false);
        }
        public bool TryAdminLogin(string userName, string password, out LoginToken <Administrator> token)
        {
            _administrator = new AdministratorDAOMSSQL();
            Administrator administrator = _administrator.GetAdministratorByUserName(userName);

            if (administrator != null)
            {
                if (administrator.PASSWORD == password)
                {
                    token = new LoginToken <Administrator>()
                    {
                        User = administrator
                    };
                    return(true);
                }
                else
                {
                    throw new WrongPasswordException("Wrong Password Exception");
                }
            }
            token = null;
            return(false);
        }