Rescue crews were searching waters off Key Biscayne after a man reportedly fell out of a private plane with no parachute at about 2,000 feet in the air while over water.
The U.S Coast Guard said they were searching two miles southeast of Key Biscayne by sea and air. The pilot of the Piper PA46 is also being questioned by police.
The pilot told air traffic controllers that a passenger fell from the aircraft about eight miles southeast of Tamiami Airport, about one mile offshore at around 1:30 p.m., the Federal Aviation Administration said.
The plane flew on to Tamiami Airport and landed safely, the FAA said.
In the mayday call to air traffic controllers posted on the website LiveATC.net:, the pilot said: "I have a door ajar, and a passenger that fell down. I am six miles from Tamiami."
A little later in the exchange, the air traffic controller asks: "So you said you had a passenger who fell out of your plane?"
"That is correct sir. He opened the back door, and he just fall down the plane," the pilot said.
The pilot had contacted FAA air traffic controllers at Miami Terminal Radar Approach Control, which provides radar service to flights that are within a 55-mile radius of Miami International Airport. The control center then notified the Coast Guard.
"The FAA notified the U.S. Coast Guard and Miami-Dade Search and Rescue," the FAA said.
The Coast Guard was searching with a small boat, and Fire Rescue had three marine units and two planes.
Anyone with information regarding the possible person in the water should call the Coast Guard via VHF marine radio channel 16 or by calling 911.