Delta Air Lines to offer Shake Shack burgers to first class customers

Delta Air Lines’ first-class passengers will soon be able to order Shake Shack burgers on flights, the burger chain said Tuesday.

Starting Dec. 1, first-class customers flying out of Boston on routes of more than 900 miles will be able to pre-select a ShackBurger made with a beef patty on a potato bun served with lettuce, tomato, and signature ShackSauce on the side. It will be served with chips, a Caesar salad, and a dark chocolate brownie….