First-class flights are about to get tastier for some Delta fliers.

Delta Air Lines has just announced that their partnership with Shake Shack is going to be expanded to routes out of four cities.

Beginning today, March 4, first-class passengers on flights with a distance longer than 900 miles going out of New York-La Guardia (LGA), Atlanta (ATL), Los Angeles (LAX), and Seattle (SEA) will have access to Shake Shack burgers, as well as Caesar Salad and a brownie.

“Our partnership with Delta has been a truly fantastic way to bring Shake Shack to even more guests in a setting where hospitality truly matters – while traveling,” said Michael Kark, President of Global Licensing at Shake Shack, said in a statement shared with Travel + Leisure. “The response has been incredible, and we’re thrilled to expand this partnership, giving even more Delta travelers the chance to enjoy Shake Shack along their journey.”

The partnership between Delta and Shake Shack was launched from Boston in 2024, and first-class passengers can choose the option before their flight. Additionally, Delta, Shake Shack, and Uber Eats are offering a “buy one get one free” for ShackBurgers on Uber Eats for members who have joined the Delta x Uber waitlist by March 6.

“Customers are raving about the Shake Shack experience onboard our flights after serving more than 10,000 burgers out of Boston since launching in December,” said Stephanie Laster, Managing Director of Onboard Service in the statement.

And the airline hinted that more cities might get the option soon, stating, “With more expansions on the horizon, you never know where burgers might fly next.”