Take 10% off Frontier Airlines domestic fares via this link with code: PLAYBALL
This offer ends 11:59 p.m. EST, Wednesday, February 26, 2014. The discount will apply to regular and sale fares for travel through June 12, 2014.
(Click here to learn about Frontier Airlines 50,000 Bonus point offer (2 FREE flights) on the Frontier Airlines credit card)