yeah.... thats for flight tracking software... this is not flight tracking software. this is an MP3 encoder that encodes the actual scanner audio. That scanner audio is realtime. there is no way that I know of where the FAA can put a delay on live ATC transmitions, I doubt it exists.
Therefore on average you are getting a 20-50sec delay due to encoding, sending, buffering, decoding and your specific internet connection speed.
The topic got changed to flight tracking.