It depends on the agreement that UA has with Great Lakes Airlines. The RKS-DEN, as you know, is operated by Great Lakes via a codeshare and your bags arrive at your destination via an interline agreement.
I cannot find anything on UA's website saying that Great Lakes is a mileage awards partner, but I did find numerous times the following language:
"Travel on code share flights operated by other airlines is excluded."
This is pretty standard for most programs.
I'd suggest using the miles you have accumulated on the DEN-XXX leg and pay for the Great Lakes leg on its own. I'd assume you'll save some money that way.
Also, it is a drive, but if you're in the mood to fly on just miles, you could drive a bit to a Frontier city. Jackson Hole will be served by Lynx starting on May 15, and Grand Junction will be served by Lynx starting on May 1.
Checko
Last edited by GreatChecko; Feb 27, 2008 at 7:31 am