Frontier Airlines wants you to go wild. The Denver-based low-cost carrier announced its new GoWild! annual flight pass, offering unlimited flights starting May 2. "If you’re thinking about traveling at least once a month, this makes sense for you," Frontier CEO Barry Biffle told USA TODAY. "If you’re willing to travel once a week, this is a no-brainer." Through Thursday, a limited number of passes will be available for $599. Ordinarily, the pass will cost $1,999 per year, and will automatically renew at that rate for those who buy the GoWild! Pass.  But before you purchase your own pass, click the link in @usatoday's bio to make sure you read the fine print.