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What to do in the cellphone waiting lot:
Go to LiveATC.net, type "KAUS" in the top left box for "Airport". Click on the 2nd green "Listen" button, the one that says "launches in your MP3 player". Enjoy hearing all the arriving and departing airport traffic talking to ATC. Listen for the flight you're waiting for.
Or there's an iOS app or Android app
Don't forget to combine that with LiveATC so you can hear them too.
app is kind of old and ugly but still works OK