The 48-year-old woman was arrested on the airplane after she was spotted performing the sex act on a 28-year-old man in his seat.
No charges are likely against the two strangers who hooked up on a Delta flight bound for MI.
According to information, the man flew in response to Miami, while the woman continued for Nashville.
The unsafe quest to join what's known as the "Mile High Club" has landed two more people in hot water.
Two strangers were ticketed after authorities say they were caught having sex on a Delta flight this weekend. The investigation was handed over to the FBI, and now the two passengers may be charged with a misdemeanor or even a felony.
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"The act itself is inappropriate in a public space", one passenger told the station.
Meanwhile, passengers on the flight who spoke to WDIV weren't too pleased about the couple's X-rated display.
Delta Airlines refused to make any comments about the incident, while research continues.
A spokesperson for the Detroit Metro Airport confirmed to the Detroit Free Press that the duo was taken into custody upon landing, but that the FBI took over the investigation in a nearby building.
The FBI said charges could be issued in the case as early as Tuesday.