SEPANG, Malaysia (AP) — An American adventurer said Saturday that it would be a "very lucky discovery" if the piece of aircraft he found on a sandbank off the coast of Mozambique is confirmed to be from the Malaysia Airlines jet that vanished two years ago.Blaine Gibson, who said he's been searching for Flight 370 over the last year, flew to Malaysia to attend a commemorative ceremony to be held Sunday by families of the 239 people who were on board the plane to mark the second anniversary of its disappearance.Speaking to The Associated Press upon his arrival at the airport outside of Kuala Lumpur, Gibson said that he had wanted no publicity about his Feb.