"In Florida, you can shoot guns from the sky in some situations," Guy Haggard, a lawyer specializing in aviation issues, told the Tampa Bay Times.
The Federal Aviation Administration is investigating the incident as well, the Times reported.
Passengers who were in the small plane told the Times that they spent an hour finding a spot to shoot the gun in order to keep anyone on the water safe.
“There was no one close to us, no one for at least 10 miles," Mark Serbu, a passenger on the plane, told the Times. "We did everything safe.”
Read more at the Tampa Bay Times.