RedactedNarrative: Air boat being operated during windy conditions flipped over causing four POB's to be ejected into the water. Incident occurred close to the shoreline and all occupants were able to swim to safety. Vessel was pulled out by owner with aid of a winch. Approximate damage to vessel, $3,000.00. Investigation revealed the following:   Vessel operator has approximately 100 hours experience operating this vessel. All passengers were relatives. Operator admitted having knowledge that it was very windy to be operating an air boat at the time of the incident and was staying close to the west end of the lake. The water was choppy caused by windy conditions. The operator was idling through a narrow canal with aquatic vegetation on both sides, viewing wildlife.  As the operator was making a left turn to swing back out into Lake Griffin, a strong gust of wind blew against the port side of the vessel, causing it to flip over; ejecting all passengers overboard and into the water.  There was approximately 909 lbs. of body weight on the vessel which may have played a contributing factor in the vessel flipping over.