Delta is offering 1000 bonus miles for online roundtrip ticket purchases through December 31st provided payment is made with an American Express card. The bonus can be earned up to 25 times and registration is required.
Any American Express card will do, it doesn’t have to be a co-branded Delta Amex.
The link works, but the subsequent registration function says…
I’m sorry, your session has expired. Please start your enrollment again.
…no matter what you do. Help!