Transmission delays?

[trenaj]

I was listening to JFK chatter on 15Dec09 and at the same time following flights on www.flightaware.com when I noticed that departing flights seemed to appear on flightaware approx. 30 minutes (!) before I heard the pilots/controllers arrange their takeoff and departure routines. That surprised me - I can see that data on flightaware is delayed, but the other way around, and in particular by a full 30min surprises me. Does anyone have insight into this?

[cstefano]

Was actual en-route data coming in early, or was the flight just listed with a scheduled departure time from a filed plan?

[Jason]

The delay usually runs between 5 - 7 seconds and varies by feed and listener connection. You may have seen proposed flight plans on FlightAware without departure and enroute data quite yet. FlightAware data is approximately 5 minutes behind real time.

Best,
Jason

[bleyton]

One thing that threw me when I was listening to my Burbank feed was that sometimes I would stop/start the player (I was using Windows Media Player).  Normally it picks back up with the real-time audio, but a few times it has started playing back the last segment that I had already listened to.  When I started recognizing tail #'s and snippets of conversation, I realized what was going on.

Is it possible that that's why you seem to be hearing stuff that already happened?

Brian
Your KBUR feeder