As some of the special airline tickets and air tickets on some routes, only through the paper in the form of ticket purchase, and to check with the specific circumstances related to the airline.

• 由于目前航空公司的一些特殊票和某些航线上的机票，还只能通过纸质机票的形式进行购买，具体情况要查询相关航空公司的规定。