[U.S. Navy LT. JG Dylon Porlas uses binoculars to look through the window of a U.S. Navy Lockheed P-3C Orion patrol aircraft from Sigonella, Sicily, Sunday, May 22, 2016, searching the area in the Mediterranean Sea where the Egyptair flight 804 en route from Paris to Cairo went missing on May 19. Search crews found floating human remains, luggage and seats from the doomed EgyptAir jetliner Friday but face a potentially more complex task in locating bigger pieces of wreckage and the black boxes vital to determining why the plane plunged into the Mediterranean. (AP Photo/Salvatore Cavalli)]CAIRO (AP) — A French ship joined the international effort to hunt for the black boxes and other wreckage of EgyptAir Flight 804 Monday, searching for clues to what brought the plane down, as Greek and Egyptian authorities diverged on what happened to the plane during the crucial final minutes before it crashed into the Mediterranean, killing all 66 people on board.