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This funny footage appears to record the moment a pilot accepts a race from a nearby plane and lets his passengers know.

In the clip a voice-over can he heard saying: "Ladies and gentlemen, this is your captain speaking.

"If you look to the right side of your aircraft, you will notice flight 198 challenging us to a race.

"I've turned the fasten seatbelt sign back on, s*** is about to get real."

It is not known on which airline the recording took place.

It was originally uploaded last year but has become popular across social media in the last few hours.

Most viewers have slammed it as a fake.

Youtube commentator DukeFan1971 gives his comprehensive reasons.

He said: "It's not real, because: one, The captain of any flight is not allowed to randomly curse over the P.A.

"Two, planes would never be allowed to fly that close to each other by air traffic controllers.

"It presents too much of a danger of collision, especially when you consider that they have to control sometimes dozens of flights at different altitudes and keep them from crashing into each other while they're changing speed, direction and altitude.

"Three, passenger jets are not allowed to race each other while passengers are aboard, by FAA rules.

"Four, anyone on such a flight, if you completely forget about numbers 1 to 3, would be wanting to catch the reaction of the other passengers, part of the race, something. No one would cut off a video of something like that at that point."