一、需求分析

（1）．可以录入航班情况（航班信息可以储存在数据文件中）。

（2）．查询：可以查询某个航线情况（如输入航班号，查询起降时间，起飞抵达城市，航班票价，票价折扣，确定航班是否已满），可以输入起飞抵达城市可以查询飞机航班情况。

（3）．订票：可以订票，如果该航班已无票，可以提供相关可选航班。

客户资料有姓名，证件号，订票数量及航班情况，订票要有编号。

（4）．退票：可以退票，退票后可以修改相关数据文件，

-First, demand analysis (1). The situation can be recorded flights (flight information can be stored in the data file). (2). Query: can search for a route (for example, enter the flight number, inquiries, taking off and landing time, to take off on arrival, flight fares, fare discounts, to determine whether the flight is full), can enter to take off on arrival the situation can search for flights. (3). Booking: You can booking, if the flight no longer vote, can provide relevant optional flight. Customer information name, identification number, the number and flight booking, the booking to have ID. (4). Refund: You can refund, a refund can be amended after the related data files,