If you’ve flown in the past few years, you’ve probably noticed that the flight attendants and/or pilots will tell you to put your phone in “Airplane Mode” before takeoff. While most of us will dutifully oblige, have you ever stopped to think about why they ask you to do that? Hint: It has nothing to do with the plane crashing, contrary to popular myth. Below, we explain why passengers putting their phones on Airplane Mode is a crucial part of every flight. It’s not for the reasons you might think, but it’s important to keep in mind.