I'm at the SFO SC. I tried last night and this morning to do a co-terminal SDC from SJC-SEA to SFO-SEA but I'm on a super-cheap award ticket (5,000 pesos) and there was no N availability. Then SJC-SEA posted a 40-min delay and I got to change after all
SFO-SEA is delayed too now, but still gets in ahead of the SJC flight.