Oh, it's not just SFO. The first time I ever flew in my life (I was about ten years old), out of Sacramento, we were delayed for hours due to that awful tule fog making it impossible for our inbound equipment to land at SMF. They diverted the plane to Reno, where it refueled and waited for the fog to clear. We eventually got the flight, but of course we'd missed our connection at Denver for Kansas City. (We were traveling to visit my grandmother's relatives in mid-Missouri.) They eventually found us standby seats on a Frontier (the old version) Airlines flight, and we got there, but many hours late.