That toaster is part of the trick to pulling this off. Because, surprisingly, the burger tastes like Shake Shack should. On a recent flight from Boston to Atlanta, the only giveaway that this was an in-flight meal was the lack of French fries—a dish most airlines are still trying to perfect. Fries tend to lose their crispiness when they’re reheated, and nobody wants a soggy potato stick. American Airlines Group Inc. is experimenting with a special container to keep in-flight fries appropriately crunchy, but Alaska Airlines, Delta and United, which have all evaluated or even tested the side dish for their menus, don’t currently offer French fries to customers. “I don’t care about being first to market,” says Ash Dhokte, Delta’s vice president of onboard services, when asked about fries during a visit to the flight kitchen. “I care about being best in class.”