Passengers questioning directives to turn phones to aeroplane mode mid-flight are on the rise, but it turns out there really is a very good reason for it.

We all know someone who’s forgotten to put their phone on aeroplane mode while flying, and they proclaim nothing happened. In fact, claims there is no need for aeroplane mode on flights have been on the rise for years.

But now, a slightly fed-up U.S. pilot has taken to social media to explain why switching your phones to aeroplane mode is actually extremely important for the crew flying your plane.

“This is just a friendly PSA that the aeroplane mode button on your phone is not a conspiracy," began the pilot, known online as PerchPoint.

“If you have an aircraft with 70, 80, 150 people on board and even three or four people’s phones start to try making a connection to a radio tower or for an incoming phone call, it sends out radio waves," he explained.

“There’s a potential that those radio waves can interfere with the radio waves of the headset that the pilots are using."

He then gave a very real example, for anyone who wants to brush off the problem.

“Last night in San Francisco, we had pushed off the gate," he recalled. “We were talking to the rappers, we disconnected from the tug, started the engines and then once we got the plane turned around we started to head towards the taxiways."

“I called up ground to get our clearance as to which direction we had to go. And as soon as we start getting directions, there’s this really annoying buzz going through the headset and it kind of sounds like there’s a mosquito in my ear."

@perchpoint The more ya know, yanno? #fyp #aviation ♬ original sound – PerchPoint

So no, the result won’t necessarily be disastrous. The pilot even said, “The plane won’t fall out of the sky, and it won’t even mess with the systems on board." But how would you like to do your work with a bug in your ear?

“It’s not the end of the world, but it’s definitely pretty annoying when you’re trying to copy down instructions and it sounds like there’s a wasp or something flying around you."

I don’t know about you, but I’d rather the pilot of my next flight be able to concentrate fully on the task at hand. So let’s keep the phones in aeroplane mode.