public string createNewFlight(string flightNumber, int seatCapacity,
                                      float firstClassPrice, float economyClassPrice,
                                      string arrivalAirport, string departureAirport,
                                      DateTime arrivalTime, DateTime departureTime)
        {
            try {
                Flight newFlight = new Flight(flightNumber, seatCapacity,
                                              firstClassPrice, economyClassPrice,
                                              arrivalAirport, departureAirport,
                                              arrivalTime, departureTime);

                FlightDB.addFlight(newFlight);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return(e.Message);
            }
            return("Created flight: " + flightNumber);
        }
 public string showSeatingChart(string flightNumber)
 {
     return(FlightDB.showSeatingChart(flightNumber));
 }
 public string showAllFlights()
 {
     return(FlightDB.showAllFlightDetails());
 }