I seem to recall hearning about people being given an op-up with online check in - does this occur at online or airport check-in or is it only at the gate?

Travelling, on what appears to be an oversold flight form CDG to YUL tomorrow. For what its worth, there are 19 unassigned seats in J-class. Although I=3, my certs are in Toronto.

Any tips on trying to get an Op-up?

[KVS Availability Tool 3.1.2/Platinum - Apollo: ITN/US-ARL]

CDG Paris Charles De Gaulle FR [LFPG]
YYZ Toronto Pearson Int'l ON CA [CYYZ]
SUN 13 Jul 2008

Carrier Flight From Depart To Arrive A/C St Availability
--------- ------ ---- --------- ---- --------- ---- ---- -----------------------------------------
AC 871 CDG 10:30 YUL 12:00 77W 0 J8 C8 Z8 Y1 M0 U0 B0 H0 V0 Q0 L0 A0 K0 N0 I3