Took a United Airlines flight from Chicago to Philadelphia yesterday. The airport in Philadelphia was plagued by bad weather - thunderstorms - and our pilot informed us up front that we might have problems.
He also informed us that we could listen in to the radio conversations between the cockpit and various air traffic control stations along the way on Channel 9 on our seat audio systems.
I heard about United Channel 9 from Microsoft's Channel 9 web site team. United inspired Microsoft in opening up their behind the scenes operations a little.
Anyways, United Channel 9 is very fascinating. Hearing not only my plane but all the planes in the vicinity talk to controllers was comforting and enlightening. Was kind of like listening to an audio blog in the skys.
By the way, the ground control at Philadelphia airport has got some serious problems. We waited about 30 minutes after we finally landed to get clearance to the gate and one controller would not even acknowledge our plane and, when he did, was quite rude.