Airline Flights Write a program to book an airline flight. See Fig. 4.48. If the sam...

Airline Flights Write a program to book an airline flight. See Fig. 4.48. If the same airport is selected from the two list boxes, the user should be informed immediately that the departure and arrival airports must be different. If no airport has been selected from one or both of the list boxes when the button is clicked, then the user should be told what information must be provided. Use message boxes to inform the user of such problems.