编制一个航空客运订票系统，实现简单的机票操作。系统能实现的操作和功能如下：查询航线。承办订票业务：根据客户提出的要求（航班号、订票数额）查询该航班票额情况，若尚有余票，则为客户办理订票手续，输出座位号；若已满员或者余票数少于订票额，则需重新寻味客户要求，若需要，可登记排队候补。承办退票业务。-The preparation of an air passenger booking system, simple ticket operations. System can achieve the operations and functions are as follows: query route. Ticketing contractor: according to customer' s requirements (flight number, booking amount) check the amount of the flight ticket, and if there are more than votes, compared to customers for booking procedures, the output seat number　if the votes of more than or less than full members of set Ticket, you need to re-think over customer requirements, if necessary, alternate line registration. Contractor refund business.