Originally Posted by
MSPeconomist
....
IMO the OP should check very carefully for duplicate receipts with different ticket numbers in email and by searching delta.dumb and the Saudia website. It seems unlikely, but just in case two tickets were issued, it would be better to deal with this before the flight. Assuming that there hasn't (yet) been any schedule change or other reason for a reissue, there should only be a single 006- ticket number which is the same number on every piece on documentation related to the trip.
AMEX shows the flight details (including ticket number) if you look at the online statement and click the entry. That would be where I would start. And that also shows the DL/AMEX charge ref number in case one does has to argue it out.
I tend to go with the crowd though. The "phantom" charge is likely to vanish in a few days.