Frontier Airlines ran a promotion related to the Olympics where they promised a discount for future travel based on how many gold medals Team USA won during the Sochi games. Apparently a 9% discount is too confusing or not fun enough so Frontier rounded up and is offering 10% off on flights booked by 6 March 2014 for travel before 12 June 2014. The promo code is USWINSGOLD. Read more. Search/book flights.