ex-SEA you can route through LAX both ways in increasing the mileage by about 1000 (if you're an AS elite this makes sense). And the on the way out you're on a red eye.
Are complimentary upgrades gone on transcontinental flight on Delta? I'll admit I haven't been flying them much, so it came as something of a shock to see my LAX-JFK and return as "not upgrade eligible".