I'm waitlisted on Flight 835 on 10/13 from ORD to PVG and also on Flight 858 from PVG to SFO on 10/21, trying to upgrade to C with a SWU.

Res agent says C is 40% booked and that there r a few people on the waitlist on both flights. I know weekend upgrades are sometimes challenging. Are these routes difficult to upgrade during this time of year?

Thanks