STRANGERS who met on board a Delta Air Lines flight in the United States have been busted engaging in a sex act in the comfort of their seats.

The 48-year-old woman, who was bound for Nashville, Tennessee, and the 28-year-old man, who was bound for Miami, reportedly didn't know each other before boarding Sunday's flight from Los Angeles to Detroit, Detroit's WDIV reported.

But they hooked up in mile-high club style - but rather than a sneaky dash to the bathroom, this couple remained in their seats in full view of everyone on board.

The couple were busted after the woman performed oral sex on the man. They were issued notices to appear in court and the FBI is now looking into the incident.

Meanwhile, passengers on the flight who spoke to WDIV weren't too pleased about the couple's X-rated display.

"The act itself is inappropriate in a public space," one passenger told the station.

Another said: "There are children. There are families. There are seniors. These things should be respected."

Yet another added: "If people will go so far as to disrespect themselves and disrespect you, something should be done."

Federal police said the pair could be charged with anything from a misdemeanour to a more serious crime.

Earlier this year, a man and woman on a Ryanair flight from Manchester to Spain shocked onlookers when they engaged in an X-rated romp in their seats.

The pair made international news headlines when photos of their raunchy display were captured by another passenger.

It later emerged the man and woman were not a couple - he had left his pregnant fiancee at home while he partied with his mates in Ibiza for a bucks' weekend away.

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