It is SFO. In terms of number of flights and pilots based there. They fly to LHR, NRT (2x), KIX, SEL, PVG, TPE, HKG, and SYD from there. LAX now has NRT, HKG, AKL, SYD, And HKG-DEL and LAX-IAD-LHR. It is actually probably 3rd in size after SFO and ORD. Hope this helps.