说明：  C++小程序，是飞机票订票系统，用读取和写入文件的功能，可以订票，查询航班，退票，修改航班等等功能，其中查询可以通过航班号或者起始地点或者抵达抵达或者起止地点查询
(C++ Small procedures, air tickets booking system is used to read and write files, can booking, check their flight, refund, modify flights and so on, which can query the flight number or the start location or arrived in arrived in the location or start-stop inquiry)