CRS : Computer Reservation System

CRS (计算机预订系统)解决方案适时而出。CRS 不仅可以适用于传统的酒店管理环境以提高工作效率减少运营成本，尤为突出地是它可以在互联网时代有机地整合酒店信息、预订、销售等各环节为一体，通过客户 关系管理系统增加酒店的销售来源从而为酒店创造更高的商业利润。

wikipedia网站是是这样描述的：

A computer reservations system (CRS) is a computerized system used to store and retrieve information and conduct transactions related to air travel. Originally designed and operated by airlines, CRSes were later extended for the use of travel agents; major CRS operations that book and sell tickets for multiple airlines are known as global distribution systems (GDS). Airlines have divested most of their direct holdings to dedicated GDS companies, who make their systems accessible to consumers through Internet gateways. Modern GDSes typically allow users to book hotel rooms and rental cars as well as airline tickets.

链接：http://en.wikipedia.org/wiki/Computer_reservations_system

PNR : Passenger Name Record