LINK

Note: You can convert Delta Miles to NWA miles (see details here). According to this site, you can redeem 5000 miles for $50 in air fare, which translates 30,000 bonus miles into $300 in air fare. You can also exchange 24000 miles to $150 in Sky Mall gift certificates or 27000 miles to $150 in Macy's, Barnes & Noble, Shell gift cards (GCs of other stores cost more, see more details here).

yet another similar, but inferior offer


Terms:

30,000 bonus miles after your first purchase.

No annual fee for the first year, a savings of $95

30,000 bonus miles will be awarded after your first purchase on the Gold Delta SkyMiles Credit Card in the increments of 10,000 as a Welcome Bonus and 20,000 for this special offer. Please allow 8 to 12 weeks after your first purchase for the bonus miles to appear in your Delta SkyMiles account. This offer is valid for first-time Delta SkyMiles Cardmembers only. If you already have or had any other Delta SkyMiles Credit Card from American Express Account(s), you are eligible to receive only the incremental difference between the Welcome Bonus miles offered herein and the amount offered with such other Account(s). You may be permitted to have more than one Delta SkyMiles Credit Card account; however, you are eligible to receive bonus miles for only one Card account. Additional Cardmembers are not eligible.