1.　　问题描述
设计一个航班信息查询与检索系统。
2.　　需求分析
（1）每条航班记录包括8项：航班号，起始站，终点站，班期，起飞时间，到达时间，飞机型号，票价；
（2）按不同的关键字对用户指定的航班信息进行查询与检索；
（3）要求有输入和输出模块。(1. problem descr iption

Design a flight information query and retrieval system.

2. demand analysis

(1) each record includes 8 items: the flight flight number, starting point, end point station, schedule, departure time, arrival time, aircraft type, fare;

(2) inquire and retrieve the flight information specified by the user according to the different keywords.

(3) the input and output modules are required.)