Delta will start serving Shake Shack on flights. But there's a catch.

Shake Shack fans may soon have a new favorite airline, with Delta Air Lines serving up the restaurant chain's burgers on flights out of Boston beginning in December. 

The partnership kicks off on Dec. 1, and will only be available on flights out of Boston. Delta said it has plans to serve Shake Shack burgers on additional flights in other U.S. markets throughout 2025. 

There's a catch, however: the meals are only available to customers sitting in first class and on routes longer than 900 miles.