Silver Airways passengers catch couple having sex in seat behind them

A couple caught another couple joining the Mile High Club in full view of the plane cabin. (Kiley Tully Twitter)

Passengers on a Silver Airways flight were shocked to find that the people seated behind them were joining the Mile High club — from their seats.

“My mom and dad were just trying to have a peaceful trip to Mexico and then they sent me this...” Twitter user Kiley Tully posted on Sunday.

Tully's mom caught the couple in the throes of unbridled plane passion on video, and showed that the rest of the cabin seemed unaware of the shenanigans.

According to the Daily Mail, Silver Airways confirmed the video was taken on one of its flights. They had not yet confirmed that the video was authentic, but did note that the airline did not condone the behavior.

“We are taking this very seriously and working to determine the legitimacy of the video and specific flight information,” airline spokeswoman Misty Stoller told the New York Post.

Tully's mom, for her part, seemed less offended and more amused.

The couple's faces are not visible, and that's probably for the best. Although their behavior is clearly not ok on several levels, they aren't the first to push the limits of in-flight propriety. In March, two passengers were found in the lavatory in a compromising position on a Virgin Atlantic flight. Last year, two passengers who had been strangers before the flight were caught in the act on a Delta flight.