If you love taking BART to the SFO
airport as much as I do then you need to know about a change in BART
routing. I find BART to be cheap, reliable, fairly clean and convenient for SFO. Recently there was a slight improvement.
BART now has specific trains that go only to the SFO airport and don't go further to Millbrae. Similarly their are trains to Millbrae that don't go to SFO airport. Be forewarned. Don't assume the Millbrae train stops at SFO. It doesn't.
This change was not in effect when I last went to SFO on Thanksgiving and I can't find the press release announcing it. Now you know, if you didn't already.
BART is a very good transit system for America. When compared to Tokyo, of course, it is well below mediocre.