Passengers are now on their way to Atlanta after a plane at JIA was evacuated because of a potential threat.
According to Jacksonville Aviation Authority spokesperson Debbie Jones, Delta Air Lines flight 2380 was scheduled to depart at 10:10, but a passenger handed a crew member a "threatening note."
Jones did not specify what was written on the note.
Passengers evacuated the plane and the woman was detained at the airport.
The FBI is headed to JIA to speak with the woman.
Police dogs swept the aircraft and found nothing dangerous, so passengers were allowed to re-board.
The plane left for Atlanta just after noon, delayed 106 minutes.