UA is running a 747 SFO-ORD on Sat March 26. UA268 departs 130p. Oddly it's 10 minutes before a 753 running SFO-ORD on the same day. Earlier that day there's a 777 on SFO-ORD at 830a.

UA is running 2x 777 ORD-SFO on Sun April 3. At least one of these is a domestic config though.

Note, I only notice these because I'm buying a ticket to GRU at the moment and will connect via ORD/SFO on the outbound and return and noticed these flights. The $200 up charge for Global First now seems to really make sense because the domestic connections will also be in GF (though not with GF service).

PS - also worth noting that while the 757 is not a widebody the 753 is appearing quite a bit now on ORD-SEA. I've never seen the aircraft on this route before. It used to be flown with sUA 752s.

-RM