说明：  是一个航空订票系统，实现了一个订票和退票的业务功能，还有可以查询航班的信息。通过设置密码可以管理航班的信息。
(Is an aviation order form system, has realized the service function which an order form and returns a ticket, but also has may inquire the scheduled flight information.May manage the scheduled flight through the establishment password the information. )