Police and FBI agents were waiting to meet a flight at Detroit Airport after the pilot had reported a 'security issue' on board - that turned out to be a couple having sex in the toilet.
The pilot of the Frontier Airlines Flight 623, from Denver to Detroit, made the emergency call to an airport tower at Detroit Metro Airport, following reports of suspicious behaviour during the flight.
Witnesses told myfoxdetroit.com that three passenger - two men and one woman - were seen making numerous trips to the loo.
According to FOX 2's Alexis Wiley, passenger Kevin Kelly reported: 'Guys came in with machine guns and told us to keep your heads down. They took three passengers, two men and one woman, into custody.'
And, as a result, not only were FBI agents waiting for them upon landing, two F-16 fighter jets were flown in to shadow the plane as it arrived at Detroit.
According to news.com.au, police discovered that two of the passengers had been busy joining the mile-high club in the loo - and no arrests have been made so far.
Perhaps they'll think about sticking with the bedroom next time...