crimson12

I was on a LAX-JFK flight recently. It had C0 inventory, meaning no business class upgrade space (I would upgrade using a Business Extra BXP1 certificate, but an upgrade with miles would require/book into the same inventory).

I noticed that a prior flight had something like C3 available, and seats in economy as well. Would it have been possible to standby on the earlier flight and, when the standby clears, apply the upgrade? I would have to apply the upgrade (using BXP1) at the gate. I'm not sure if that's even possible.

If it's not possible to do it going standby, would it be possible to do it with a SDC? I'm PLT so the SDC would cost me $75, but obviously that's a small price to pay to confirm an upgrade on a TCON.

Basically, I know I can standby or SDC, and I know I can upgrade (assuming appropriate inventory) -- the question is, can I do both?

Thanks in advance.