Originally Posted by
MSPeconomist
It's *interesting* that DL neglects to mention that you can also enter with a regular AmEx Plat/Centurion charge card when flying DL the same day.
It's probably a simple as Delta gets a cut of revenues generation from Delta branded card sign ups and credit card spend, and I don't think they get a cut of Amex Platinum spend.
There have been suggestions that Delta limit Amex Platinum access or even somehow cut the relationship between Membership Rewards and Skymiles, but that doesn't seem to be likely. Delta cards seem popular enough even with the presence of the Amex MR charge card line.