T-Mobile offers its customers 1 hour of Gogo In-Flight WiFi on participating domestic flights for free. That's a $7 savings and the best such offer we've seen from T-Mobile since last June, when passengers could avail of a free hour of in-flight WiFi, regardless of their phone network. (This requires a valid T-Mobile phone number to access.) Click here for more information.
In addition to the above deal, T-Mobile customers can also receive unlimited in-flight texting.