飞机订票系统设计 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。试设计一民航订票系统，使之能提供下列服务： v系统以菜单方式工作 v航班信息录入/浏览功能(航班信息用文件保存) v查询航线： l按航班号查询 l按终点站查询 v承办订票和退票业务(可选项) -Aircraft booking system design assumes that civil aviation airport, a total of n flights, each flight has a flight number to determine the route (starting point, terminal), to determine the flight time (several weeks), and certain members of the set amount. Try to design a civil aviation reservation systems, so that it can provide the following services: v system to work the way the menu v flight information input/browser functions (flight information with the file is saved) v query route: l Search by flight number, l Search by destination v Contractors booking and refund operations (optional)