Originally Posted by
flyerCO
It doesn't have to deal with it being DL, but that the flight is departing the US (including it's territories). US regulations limit check-in to 24 hours before departure of the first flight. Connections can be outside the 24 hour limit as long as on the same ticket. Even if your first flight was operated by AF you couldn't check-in till 24 hours before.
Yes, and DL is also applying this 24hrs limit system-wide. If you take a DL flight from CDG, you can check-in only 24hrs before.