Just got this on my mailbox and verified with customer care that past Delta Gold Skymiles credit card holder are eligible.
60k miles by spending $1000 within 3 months.
Visit this link and login with delta skymiles account # and last name - delta.com/GOLD60K [delta.com]
This is awesome as Amex does not usually offer any promo when reapplying.
Try this link if the above link is not working - https://www.deltaamexcard.com/off...dm-nov-17/
This offer is targeted, so YMMV.