The 24/24 service provided by the AF FB Elite line, at +33 1 xx xx xx xx, is really superb. I never waited and the staff is usually very knowledgeable (and know that they are talking to a well-informed passenger, which helps get to the point quickly). It's a whole different league from the 0820 820 820 standard call center. Besides, it's a regular number, not an overtaxed one!