That SFO itinerary is ofcourse okay. What I have tried (and done) is this:
Ticket #1:
Oct. 15 FRA-YYZ
Oct. 26 YYZ-FRA
Ticket #2:
Oct. 17 YYZ-FRA
Oct. 24 FRA-YYZ
This gives me 2 one day meetings at YYZ. It also gives me a Saturday stay and a savings of around CAN$2000 (biz. class) per ticket. Totally illegal itineraries, though I don't REALLY know illegal to whom?!
Dorian!