Originally Posted by
CO EWR CPH
But isn't the chance of a SDC at CDG pretty much NIL?
I'd say it is precisely zero. You have to be on CO metal officially for it to work and the ex-CDG flight won't be. Even with the quirks where CO codeshares are sometimes permitted I wouldn't bet on it working and you have no recourse if it doesn't. Plus, SDC'ing to a future flight is a big risk in terms of hoping that the seats are there.