Incidentally, he is not the only passenger who does not wear a mask. According to the poster, the passenger would have been drunk.
At the time of the fight, another passenger shouts, “Cut down, there are children here”. A little later you can see that the bare-chested passenger is pressed to the ground by other passengers in the aisle.
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A KLM spokesperson confirmed this morning that the brawl took place on board an aircraft en route to Ibiza. Two passengers were arrested on arrival on the island. The spokesperson would like to emphasize that security has not been compromised.