At SFO this past Thursday and yesterday. SFO-DEN on United. Didn't seem doomed. I took BART from/to North Berkeley station. Visited the Centurion Lounge on the outbound. Everything was pretty normal except for all the mask-wearing, you had to walk up and make requests at Centurion buffet, and I noticed the Polaris Lounge was closed when I walked past. Every seat full on both flights.