Over a year ago I asked the CO FT-ers to list their HoKeY fares, their u/g success and the observed B/F cabin loading etc. Only a few did on this site publicly, but I have been doing the numbers for about 6 others who responded privately. We have found some very interesting facts and actually a few holes in the system and almost all of us have saved some real $$$ as a result of it. I could write a detailed book on HoKeY.
For SFO, do a shuttle to LAX and book a CO/Virgin RT from there. You will save a bundle. Thatsa lot of European trips. Good luck.
MisterNice