The latest from the airline whose scheduling practices most resembles an amoeba:

The good: Frontier is starting Charlotte – Denver on March 17 on an Airbus A319. American (US Airways) and United also fly nonstop between Charlotte – Denver.

The bad: Frontier is also ending its two existing routes from CLT — daily flights each to Philadelphia (PHL) and Trenton, NJ (TTN) — on January 4th. This means the airline won’t be flying to Charlotte at all for 10 weeks. Could Philadelphia or Trenton service return at some point down the road? With Frontier, anything is possible, but neither route is bookable from January 5th through early April, the current end of Frontier’s booking window, so this doesn’t appear to be just a seasonal reduction.

Update: Daily RDU – Trenton, daily RDU-Denver service and four-day-a-week Greensboro – Denver service also end on January 4th. Not sure if any of those routes will return later in the spring; they aren’t available at any point from Jan. 5 through the end of Frontier’s current booking window. As of now, it appears as if Frontier doesn’t fly to North Carolina at all from Jan. 5 until the CLT-DEN flight starts on March 17.