航班售票系统 设计内容：设计一个航班售票系统系统，能够对航空公司的售票进行管理。航空公司的售票系统主要包括：航线信息、订票业务、退票业务-Flight Ticketing System Design: Design is a flight ticket system system that can be managed on the airline ticket. Airline ticketing system include: flight information, booking se