Christmas is coming a bit early this year, at least if you are flying on an AirTran, Delta or Virgin America flight between 20 November and 2 January. Google is sponsoring free on-board Wi-Fi on all flights operated by these three airlines over this six week period, if the planes have on-board Wi-Fi capabilities.
What's the catch? Nothing much. It seems you'll have to access the internet via Google's Chrome web browser, so download a copy here (it is free) before your next flight.
I've used Chrome for a year or two now. It is as good a browser as any of the other browsers out there, and can be customized and made even better by adding some extensions to the basic browser.