With the holiday flying season underway and me flying out today as well, and wanted to see if I could try out some internet at 30,000 feet. Gogo Inflight Internet is now offering WiFi internet on select Air Canada, Airtran, American, Delta, United, and Virgin America flights. See here for participating aircraft.
Here are some promotional codes that will provide you with one free session of GoGo. They are good once per account. However, supposedly you can sign up with any name and any e-mail address with no confirmation system (no credit card needed either with the code), it seems like they are pretty much offering unlimited free internet until these expire. I hope I can get it to work! Via FlyerTalk.