Delta is running a targeted promotion, where members can receive 500 Medallion Qualifying Miles as well as 500 redeemable SkyMiles.
My guess is that this is targeted for some of their corporate business travelers, as I was unable to register but you might as well try and see if it will let you.
Terms and Conditions:
Eligibility: Only members who receive this communication directly from Delta Air Lines are eligible to participate in this offer. This offer is non-transferable. To participate in this offer, eligible members must register online by May 31, 2014.
Validity Period: To participate in this offer, you must register by May 31, 2014. Enrollment ends 11:59:59 PM, U.S. CST, on 05/31/14.
Mileage: Earn a one-time, 500-mile and 500 MQM (Medallion® Qualification Miles) bonus for enrolling. Only Medallion Qualification Miles will count toward Medallion and Million Miler status. Terms and conditions apply. Please see mileage credit rules and conditions.
SkyMiles Program: All SkyMiles program rules apply. To review the rules, please visit Membership Guide & Program Rules. Offer void where prohibited by law. Other restrictions may apply. Offer subject to change.
Promotional Fulfillment: Bonus miles and MQMs will appear automatically on member’s SkyMiles statement. Allow up to eight weeks after promotional validity period ends on May 31, 2014, for credit to appear.
Miscellaneous: Taxes and fees for Award Travel are the responsibility of the passenger and must be paid at the time the ticket is booked. Award Seats are limited and may not be available on all flights or in all markets. Upgrades are subject to limited availability and may not be available on all flights. All Delta Sky Club® rules apply. To review the rules, please visit delta.com/skyclub. Partner offers subject to the terms and conditions of each individual offer.
Promotional Reference Code: Please refer Delta customer service representative to 970626
Everyone loves free miles especially elite qualifying ones, so you might as try and register and see if you qualify.