Background: Online Travel Agencies (OTAs) have traditionally charged airline ticket booking fees ($5-$7 per ticket).

背景：在线旅行社一般会对预订机票收取手续费（5到7美元/张）。

youdao

Train online booking system mainly comprise of ticket query, booking subsystem, complete online ticket query (includes simple query, detail query), online booking and so on.

火车联网售票系统主要包括的火车票查询子系统、订票子系统等功能系统。

youdao

Train online booking system mainly comprise of ticket query, booking subsystem, complete online ticket query (includes simple query, detail query), online booking and so on.

火车联网售票系统主要包括的火车票查询子系统、订票子系统等功能系统。

youdao