Introduction - If you have any usage issues, please Google them yourself
a flight booking system
* 1. Firstly, choose 1 to activate a plane ,otherwise you can not do any operations
* 2. According to the document, Scotia Airlines only has two flights
* 3. Choose 2 to change flight state(ps. previous state would not display for choosing)
* 4. Choose 3 to implement reservation, booking and cancellation features
* 5. Choose 4 to view all seating information
* 6. Choose 5 to view information on a particular seat
* 7. Choose 0 to quit.