I've lived through two fog-related, heart-stoppingly close LAX-SFO-international connections now - and I will NEVER EVER connect in SFO again. On my last trip to LHR (on UA), I probably could have qualified for the Olympics I ran so fast. The woman sitting next to me wasn't too thrilled as I was beet red, wheezing, and sweating when I took my seat (this was at the height of the swine flu scare...). Least welcoming look from a seatmate ever.