I've been wanting to try out the "new" C-class 767s and I'm looking at two itineraries (same price)...I'm a 1P upgrading with e500s and although I'd obviously prefer the SFO-ORD route since it would be much longer than DEN-ORD, I'm wondering if (on a SATURDAY), trying to upgrade the SFO-ORD segment would be a lot more risky than DEN-ORD? Any fellow Saturday travelers care to comment? Saturdays are typically my big travel days and I've had great upgrade percentages in SFO and DEN despite the horror stories of huge F waitlists at SFO.