系统为客户提供下列服务：

查询航线：根据旅客提供的终点站名输出下列信息：航班号、飞机号、周几飞行，最近一天航班的日期和余票额；

2承办订票业务：如无，则预约登记，排队等候；

3承办退票业务：如遇退票，则查询预约客户；

实现提示：每条航线应包括的信息有：终点站名、航班号、飞机号、飞行日期、乘员定额、余票额、已订票的客户名单和预约名单。-System to provide the following services: query route: according to visitors to the terminus of the name of the output the following information: flight number, flight number, a few weeks of flight, flight last day of the date and amount of remaining votes　two contractors booking business: If no, reservation register, wait in line　3 contractors refund business: In case of refund, then check booking customers　achieve Hint: Each route information should be included are: terminal name, flight number, flight number, flight date, the crew fixed, I Ticket , has been booking the customer list and appointment list.