dude are you that stupid? a plane flyin straight toward the ground in a speed of about 600 mph hitsï»¿ the ground and blows up. how can there be anything left? are you joking? no plane could crumble like that. yes it can because of the explosion and heat, most of the things burned, and yes even metal. i know this because i am learning to be a pilot and taking lessons. so before you go commenting stuff you dont know about, atleast ask someone.