Originally Posted by MichielR

Don't know about the AC part but for LX that's how the OpUps show in practice: They are visible in the app (though usually only about 60 min before departure), but not in MMB. The electronic BPs in passbook and the app are not updated either. The beep when scanning the BP will get the printer spit out a 'new seat' receipt. Also, if you're on a B77W (MIA, ORD, LAX, SFO) 11A is a throne seat - only available for LX HON/SEN or against a fee, which not many people want to pay.

Hope you end up in 11A, probably not many HON and SEN booked, plus half empty C and oversold Y.

This would be the better thread: Swiss Op-up