Over the past 2 years, WN has said they would like to serve COS in the near future.
Right now WN is focusing on increasing frequency in there current route network. It will be a while before they decide to start expanding there route network, then maybe they will add COS. DEN is a possibility, but they seem to be more interested in COS since its an underserved market with a lot of potential.
WN has some big plans for COS if they come. They plan to use COS as a mini transfer hub with service to multiple destinations in the US.
Gate space isn't a problem, there is plenty of it at COS, and COS can be easily expanded.
I heard LGB-DEN service from JetBlue is coming soon. Although its just a rumor, so I don't know if its true.
It'd be nice if they increase JFK-DEN service. Currently they only have 1 flight a day, and its a red-eye.
The flight departs JFK 9:30PM and arrives at DEN 11:55PM. Then it departs DEN at 12:50AM and arrives at JFK 6:20AM. A 2nd flight during the day would be nice. Jetblue's JFK-DEN service is the ONLY JFK-DEN service.
"Generosity is giving more than you can, and pride is taking less than you need." - Khalil Gibran