The radio, which had been silent for a while, came alive again; apparently the pilots had switched over to a different frequency, and apparently that frequency was being used by Taipei Center, since all the transmissions now seemed to originate from there. Taipei Center seemed to be managing a large number of Boeings and Airbuses. These were helpfully identified, not only by their call signs, but by their origins or destinations as well, and so Zula got a clear impression of an extremely busy airport handling jumbo jets coming in from, or flying out to, far-flung destinations such as Los Angeles, Sydney, Tokyo, Toronto, and Chongqing.