说明：  飞机订票系统设计： 要求： 假定民航机场共有n个航班，每个航班有一航班号、确定的航线（起始站、终点站）、 确定的飞行时间（星期几）和一定的成员订额。试设计一飞机订票系统，使之能提供下列服务： 1、航班信息录入功能(航班信息用文件保存) 2、航班信息浏览功能 3、查询航线：（至少一种查询方式） 1按航班号查询 2按起点站查询 3按终点站查询 4按飞行时间查询
(Aircraft booking system design: requirements: the assumption that there are n Civil Airport flights, each flight has a flight number to determine the route (the starting station, terminal), to determine the flight time (several weeks) and a member of a certain set amount. Test design one aircraft booking system so that it can provide the following services: 1, flight information entry function (flight information using file) 2, 3 flight information browsing, query routes: (at least one query mode) one by flight number Query 2 Query 3 points according to the starting point for inquiries by the terminal 4 in accordance with time-of-flight inquiry)