MQD Shortcut: Hertz rentals earn 1:1 MQD through Dec 15 — book by Sept 20.
Delta cobranded Amex cardholders can earn 1 Medallion Qualification Dollar per dollar spent on Hertz base rental rates booked via Delta's carsandstays site. The promo runs August 24 through booking deadline September 20, with rentals completed by December 15. Only the base rate before taxes and fees qualifies, and using miles as payment kills MQD earnings entirely. The Expedia white-label prices may not be competitive, so run a cost-benefit against buying MQD directly through flight spend or other promos.
the play
Book your Hertz rental through carsandstays.delta.com before September 20 to stack 1 MQD per dollar on base rate with your Delta Reserve, Platinum, or Gold Amex.