Originally Posted by
fumje
I would guess there's a slim chance, rather than no chance at all. But in any case, they won't split-clear you until after you check in, so you can wait until two days before the flight, when the upgrade waitlist becomes visible, to decide on withdrawing the request or not.
It is a Thursday night flight, not Tuesday/Wednesday flight. There may be some GS and premier members with Premium economy tickets, who are waitlisted for upgrade. OP would be waitlisted after these pax. The seat map has a lot of seats available, which is not a good indicator. J7 with one week to sell more seats is not a good indicator for OP. Good luck.