I don't fly as much as a lot of you. I have taken exactly two flights in my life for work. That said...
Overall Domestic: I've flown MCI-DEN and vv 49 times, but only 31 times on UA.
UA Domestic: MCI-ORD and vv, 38 times.
Overall and UA International: IAD-LHR, 3 times.
Now that I'm not beholden to only one airline, I don't tend to fly a lot of repeat routes.