By mid-summer, Frontier will be offering non-stop service from St. Louis to 10 destinations. The airline plans to add 3 weekly flights to San Francisco, CA; Trenton, NJ; and Portland, OR.
http://www.usatoday.com/story/todayi...louis/5604671/
Earlier this month, United announced plans to de-hub Cleveland. It looks like Frontier will be taking some steps towards moving in. Starting in June, Frontier will be offering non-stop service from CLE to Orlando and non-stop seasonal service to Seattle.
http://www.flightglobal.com/news/art...ubbing-395951/