If you’re looking to get away from the winter weather, the folks at FlyerTalk found some attractive fares to Hawaii for February and March. Just searching now, I found plenty of availability in February and March for weekends.

Details are on the FlyerTalk thread:

http://www.flyertalk.com/forum/mileage-run-deals/1421400-aa-dl-phx-hnl-298-ai-rt.html

Edit: Now apparently available from the San Francsico area as well:

http://www.flyertalk.com/forum/mileage-run-deals/1422039-aa-sjc-hnl-296-ai-rt.html

http://www.flyertalk.com/forum/mileage-run-deals/1422035-aa-oak-hnl-296-ai-rt-ha-match-some-dates.html