飞机订票系统，任务：通过此系统可以实现如下功能：

录入：可以录入某个航班情况（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，可以提供相关可选者航班；

退票：可退票，退票后修改西相关数据文件；

可户资料有姓名，证件号，订票数量及航班

修改航班信息：当航班信息改变可以修改航班数据文件

-plane reservation systems, tasks : the system can achieve the following functions : recording : Input can be given flight (data can be stored in a data file, the data structure, specific data set) Inquiries : can find a route (for example, the importation of flights, landing inquiries, arrival takeoff, flight fares, discount fares, flights to determine whether the Mancang); can import arrived in town to take off, inquiries flights; reservations : (booking situation may exist a data file, structure their own creation) could booking, If the flight had no vote, could provide flights were optional; Refund : Refund can, Refund West altered documents related data; households may have information name, documents, booking flights and the number of flight information changes : When the flight infor