SAN JUAN, Puer­to Rico — A small plane crashed into the sea ear­ly Sun­day off an out­ly­ing Puer­to Rican island and the sin­gle occu­pant was killed, author­i­ties said.  The twin-engine plane was head­ed from the tiny island of Cule­bra to a region­al air­port on Puer­to Rico short­ly after day­break when it went down, state­ment said.  The pilot’s body was recov­ered by a police mar­itime unit that locat­ed a small debris field of fuse­lage. Police iden­ti­fied the pilot as Leo­nis Viouf, a 36-year-old res­i­dent of the cen­tral Puer­to Rican town of Caguas.  The plane belonged to Air Fla­men­co, and Viouf worked for the tiny car­ri­er, police said.  Based in Puer­to Rico’s cap­i­tal of San Juan, Air Fla­men­co flies sched­uled routes with­in the U.S. ter­ri­to­ry as well as char­ter flights to the Vir­gin Islands, Domini­can Repub­lic and St. Maarten, accord­ing to its web­site. Phone calls to Air Fla­men­co went unan­swered Sun­day.  The make of the plane was not imme­di­ate­ly dis­closed by author­i­ties. Fed­er­al avi­a­tion author­i­ties were inves­ti­gat­ing the cause of the crash.