Prinair Flight 277 was a regular passenger flight by Puerto Rican airline Prinair, between Cyril E. King International Airport in Charlotte Amalie, St. Thomas, United States Virgin Islands, and Isla Verde International Airport in Carolina, Puerto Rico, a suburb of San Juan. On 5 March 1969, the flight, operated by de Havilland Heron 2D N563PR, crashed into a mountain near Fajardo, killing all 19 occupants on board.