Well LP, can't say for sure being CLT-DEN service starts in March. However alot of service is being suspended for winter according to Bob Westgate, Frontier's Senior Director of Schedules because Frontier is "very tight on aircraft" for Q1 2016 due to returning a bunch of the A319s while the some of the new aircrafts on order are delayed (A320neo/A321).

Not sure about other places but I know that F9 drastically cut service from PHL and TTN (Trenton, NJ) in Q1 16'

http://staugustine.com/news/local-ne...ustine-service