I actually just called Frontier to ask if we get miles credited for flights bought at the airport, and the agent said that we do. She did say, however, that there is a $10 booking fee if bought at the airport.
Based on the previous comments in this thread, that is not the case. But if any of you would like to set the record straight on this matter once and for all, I would appreciate it.
As I am seeing Buck Fares right now, the thought of getting a bunch of miles for around $2 with a ticket bought at the airport sounds somewhat enticing.
A mileage run on Frontier? Who knew..LOL