SFO Lounge Downgrade
https://www.flyertalk.com/forum/alas...ka-lounge.html
T3, from the closest exit to T2, to the actual TSA line of T2 is about a 45-60 second walk. The issue is depending on the time of day both checkpoints can be busy even for TSA pre. You can always go to the Intl G checkpoint to bypass the T3 checkpoint mess and use precheck there. But T2 can be a zoo or completely empty. I've made the trip from the Centurion to T2 in about 5 minutes on good days.
Oneworld Sapphire will do nothing for you since you're flying on AS, which is not a OW airline.