We used to get DL’s E-175s (LAS, since canceled from covid, and SEA which has upgraded to mainline for the time being, although both are scheduled on the route still)
Occasionally United’s E-175 (mainly just their CRJ-700 for the Express flights)
And yes, we get JSX E-135/45s
For the first time ever (to my knowledge) we got a Contour flight at 1am