CLARENCE, N.Y. (AP) — Investigators have located key components that might help reveal what the pilot did to try to save Flight 3407 during its final desperate seconds, when the plane plunged to the ground so suddenly that sending a mayday was impossible, an investigator said Monday. After a seemingly routine flight, the airplane endured a 26-second plunge before smashing into a house in icy weather about six miles from Buffalo Niagara International Airport on Thursday night, killing 49 people on the plane and one on the ground.