AA has so many flights out of NRT that I would be somewhat surprised to have no L availability each day on at least one of these flights. You need to check NRT-ORD, NRT-JFK as well as NRT-LAX, NRT-DFW and of course your first choice would be NRT-SJC (San Jose is 30 miles from SFO, so you don't need to fly from SJC to SFO, just drive or take a bus).