On June 24 , 1972 Prinair Flight 191 crashed after going around just after touching down at Ponce 's Mercedita Airport , killing five of the 20 occupants ( including both pilots ) . An accident investigation found that the go-around was prompted by a vehicle on the runway , but the investigation was re-opened three years after the accident due to evidence that there was no vehicle on the runway ; the second investigation concluded that the go-around was due to unknown reasons
Prinair Flight 191
Prinair Flight 191
Prinair