A very good read, thanks. Few questions though

来源: 于 2014-03-25 15:23:31 [旧帖] [给我悄悄话] 本文已被阅读：次
1. When the "handshake" process is established, who or which part on the aircraft end is responsible for responding to a "ping"? 

2. What regions are "Northern and Southern corridors" referred to?