Confidant’s holiday campaign for Shake Shack is offering travelers at New York’s John F. Kennedy International Airport a box of free fries if their flights are canceled or delayed between Dec. 22 and Dec. 24, and those traveling from other US airports can tag the brand on Instagram with selfie evidence of travel delays to receive a voucher for free fries. A “Can’t Fly? Have A Fry” video promotes the campaign with a branded version of “Jingle Bells” performed by GroundStone, an a cappella group based in New York.