查询航线、客票预定和办理退票等。具体功能有：1) 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）；2) 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；3) 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；4) 退票： 可退票，退票后修改相关数据文件；5) 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；6) 修改航班信息：当航班信息改变可以修改航班数据文件。-Query routes, ticket booking and obtain refunds. Specific functions: 1) Input: Entry flights (the data can be stored in a data file, the data structure, data custom)　2) query: can query a route (eg, enter the flight number, the query taking off and landing time, take-off distance of the city, flight fares, fare discounts, to determine the flight Mancang)　can enter the take-off distance of the city, queries aircraft flight situation　3) tickets: (ticketing situation can exist in a data file structure set) can book your tickets, can provide optional flight if the flight has been without a ticket　4) Refund: Refund, refund modify the data file after　5) Customer information: name, identification number, ticket number and flight availability, orders must number　6) to modify the flight information: when flight information changes can modify the flight data files.