I wouldn't be suprised if it was the DEN-MCI or MCI-DEN route....a lot of the flight options to MCI (connecting through DEN) on ual.com are starting to include a bunch of multistop Great Lakes Aviation flights on the Beechcraft 1900...the normal flight time of around 1 hour and 30 minutes on United mainline is stretched to around 3 hours on Great Lakes because of 1 or 2 stops (10 min. in duration) at various small towns in Kansas like Dodge City and Garden City. The planes have no bathrooms so you better make sure you go in DEN or MCI before you strap in for the 3 hour trip....after a Starbucks Venti, that's nearly impossible for me