Our flight from San Francisco to Seoul Incheon was departing at 11:30AM, and we arrived at the airport plenty early, at around 8AM. Korean Air departs from International Terminal A at SFO, and they use check-in Zone 9. Their check-in only opened at 8:10AM, so they were just setting up as we arrived.
The check-in process was friendly and quick, and we were soon handed boarding passes all the way to Kathmandu, and invitations to the British Airways Lounge, which Korean Air uses for their premium passengers at SFO.
Often security at SFO’s international terminals is horrible, though fortunately we arrived ahead of the big rush, and we were through security in a matter of minutes. While SFO’s Terminal 2 and International Terminal G are quite nice, I find that the shopping and food options are fairly limited in International Terminal A.