its not a payphone. its a standardized number that can come from any department at the airport. it could be security, baggage, and airline office or really anybody that has a phone at the airport (airline offices) etc...
I got this also - at 7.15EST which was 4.15 PST!! The f'ers woke me up! I had some lost baggage at JFK/ Delta which is all I could think of. I didn't get to the phone (it was charging in the other room) but they didn't leave a message.
Got a call yesterday (11/4/09) from this number to my answering service. Caller name is Matt. Weird message - not looking for what we do, just complimenting us on our website (redlichlaw.com).