Bad news with AS... Their gate agents seemingly have all been told "if they're not in the computer (CASS) they DON'T jumpseat!!!" CO is a pretty good bet, and their ANC folks are awesome to jumpseaters. DL out of SLC will work, NWA out of MSP is always FULL FULL FULL. Even if it shows 20 open seats, you can bet there will be 30 NW guys standing there with fishing poles. Frontier does a DEN-ANC in the summers as well. Always look for something with open seats. Even if you are cockpit elegible on a certain carrier, chances are that the guys flying the thing won't want someone in the JS for a flight THAT long. As far as instate jumpseating, Everts Air Cargo is the way to go. As long as they can verify you with your crew sked dept, you're good to go. Just remember, non-rev/JS to AK works like a funnel. Once you pick a carrier that looks like it has space and travel to their hub city, you're pretty much committed for the day; if it backfires, you probably won't have time to get to another hub and try from there. Coming back, you're golden. Most Lower 48 flights from Anchorage are redeyes; take whatever flight you can get on to any hub (where you will most likely arrive about 5 in the morning) and you have all day to go on from there.
Good Luck.
(signed)
A guy who has been non-revving/jumpseating to/from Alaska WAY TOO LONG