Tsa Den?
 

Does TSA have a Denver base??? On their website in the route map under United Express it says Denver as a hub???

TSA does not. Hub does not equal crew base or domicile. TSA's domiciles are STL and RIC.

And don't expect to even fly through DEN unless you're senior in STL on the American side...just a few STL/RIC United turns a month through there.

I was going through denver quite abit last month
every week, it was as a leg that finished my trip.
I done it a fair amount on the ax and ux sides.

Flying trades off every month, seems that the code shares adjust schedules to meet their projected needs every month

Yep I suppose that makes sense...I just haven't personally seen many pairings involving DEN :-)

...does TSA have a favorite of united/american/us air? or is it all just fair game out there...

united and american are the two biggest operations for TSA, i think united is probably the largest of the two. As far as flying in and out of Denver, just did it several times last trip, and will be doing it several times on the next one. Not overly uncommon, but i have only done the overnight a handful of times.

also where you're based determines what you fly insofar as the carrier. out of STL most is american, with a decent amount of United (which goes junior) out of RIC there is (almost?) no American flying.

and i was in and out of denver twice in 2 days last week with a hi-mins captain. there seems to be little rhyme or reason hot trips get made