Originally Posted by
cfischer
this is very tricky and there are plenty on threads describing that it normally does not work. DL and AF systems do not communicate well and unless someone on either side goes the extra mile it is pretty much until you get to airport before you can be certain you get your seats. For me it is 50:50.
probably too late for the OP, but this is exactly the reason why I prefer to book my flights under the operating airlines' flight number, not via a code-share. At least with AF and DL this is absolutely possible in all booking classes (not via the DL homepage, though...

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