OMG I was warned about Frontier, but I was directed to them via that slimy Priceline. DO NOT FLY FRONTIER unless you want to keep paying excessive fees for everything but cabin air, and I'll bet money they're trying to figure out how to do that. All round low end from 'service' (which is non-existent) to attitude.
Tip for consumers: SCAM airline who cares nothing about their customers.