First-class customers on Delta will have the option of ordering a Shake Shack burger from four U.S. flight markets.

Better than picking up an order of airport Shake Shack to-go and carrying it on board, hot Shack burgers are now served in-flight on select Delta routes.

Delta passengers flying out of Los Angeles will soon be able to enjoy Shake Shack on select flights, as the fast casual chain and the airline announces an expanded partnership. In November, Delta announced that first class passengers on flights of more than 900 miles out of Boston could pre-select food from the Shake Shack