Originally Posted by
irishguy28
You always check in with the operating carrier.
In your case, however, that may very well involve using the Delta website to check in for your JFK-CDG flight. I've not had an AFKL flight departing from the US in quite a while, but it used to be the case that, as Delta handles AFKL in the North American market, check-in gets steered via the Delta website.
not exactly. In the US, DL handles ground operations of AF flights, including check-in, only in DL hubs : ATL, DTW, MSP.
JFK is a special case as it is a DL hub but AF and DL operate from 2 different terminals and so their operations are completely separated. AF flights from JFK are handled by AF, including check-in. It is even reaching a completely ridiculous situation in JFK: the DL-emitted BP on AF flights are not accepted at TSA checkpoint of JFK T1. You need to stop at AF counters to have a new AF BP
So, OP will check-in with AF.