If Frontier retrofitted their plans with Gogo or Row44 I'd pay $8 or so (price of a pay-per-view movie) to get WiFi for the hour-and-forty-five-minute flight between DEN and AUS or SAT. It would also be a nice feature to integrate into Frontier's higher-class ticket options.
I've flown on AirTran out of Reagan International, and the wi-fi is a nice feature. For someone like me, that's hooked into the internet 24/7, it's well worth the money.
I'll post a message tomorrow from 10K+ feet on my way to Florida.