$6.99 brings out the cheap in all of us. But really you’re getting a gourmet burger, so kindly tip at least 20%. The people who are serving you are working hard during Burger Week so a kind word ...

D elta Air Lines is about to start serving a tasty new item on its first-class menu. The company announced Tuesday that premium flyers will soon be able to chow down on Shake Shack burgers mid-air.