In April 2011, AirTran had the best safety record among U.S. carriers as measured by the number of incidents such as bird strikes. AirTran was first with only 0.0000196 incidents per flight, Southwest second with 0.0000203, and US Airways third with 0.0000203 incidents per flight. Bill Voss, who was then head of the Flight Safety Foundation, said "the safety record in the U.S. is so good that it's very difficult to find enough accidents or incidents to draw much of a conclusion about who's safest."