LAX is obviously more junior, but with DL you also have SLC and SEA as basing options within the same general geographic proximity as LAX.
My quickest, random-est of searches shows 3 DL a day RNO-SLC and 3 (non delta) RNO-SEA. Interestingly enough, I didn't see any AA flights from RNO-LAX, but 3 DL and 3 other offline flights.