Mmm...free ShackBurger. [Photograph: Robyn Lee]

Shake Shack and Delta are giving away "burger passes" for free ShackBurgers to celebrate the opening of Shake Shack at JFK International Airport's new Terminal 4 on May 24. You can get a burger pass redeemable for one free ShackBurger at participating U.S. Shake Shacks, including the upcoming JFK location, by heading to Delta's T4X pop-up space at 376 West Broadway (map) from May 19 to 22, 11 a.m. to 3 p.m., while supplies last.

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