飞机订票系统（限1 人完成，采用顺序）

　　任务：通过此系统可以实现如下功能：

　　录入：

　　可以录入航班情况（数据可以存储在一个数据文件中，数据结构、具体数据自定）

　　查询：

　　可以查询某个航线的情况（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，确定航班是否满仓）；

　　可以输入起飞抵达城市，查询飞机航班情况；

　　订票：（订票情况可以存在一个数据文件中，结构自己设定）

　　可以订票，如果该航班已经无票，可以提供相关可选择航班；

　　退票： 可退票，退票后修改相关数据文件；

　　客户资料有姓名，证件号，订票数量及航班情况，订单要有编号。

　　修改航班信息：

　　当航班信息改变可以修改航班数据文件-Aircraft booking system (limited to one complete, using the order)

Mission: through this system can realize the following functions:

Entry:

Can enter the flight conditions (data can be stored in a data file, data structure, the specific data set)

Query:

Can inquire the circumstance of an airline (e.g., flight number input, query the takeoff and landing, take-off arrived in the city, flight tickets, ticket discounts, determine whether flight manchang)

Can input take-off arrived in the city, the query flight information

Booking: (booking situation there can be a data file, structure set itself)

Can make a reservation, if the flight has been no tickets, can provide alternative flights

Refund: can refund, refund after modify data files

Customer data has a name, id number, booking number and flight case, the order number.

Modify the flight information:

When flight information changes can modify the flight data files