The Daily Star reports that the men on the Jet2 flight, named as Jonathan JW and Nicolas S, were arrested by armed officers from the Civil Guard after the captain called ahead to the airport in Ibiza and asked police to board the plane.
The two young men appeared before magistrates and could now face up to a year in prison if they are found guilty of indecent exposure.
A civil guard spokesman said: "They dropped their trousers and exposed their private parts to the crew and passengers."
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