away the northern arc and southern arc and have very limited radar traces. you know how they are. >> you have hit the nail on the head including the northern arc and why we haven't heard about that so long. michael kay, thank you, david soucie, mark, thank you. still with not one physical piece of evidence to go on, there are theories where this plane is and what caused to it disappear and doesn't seem to be dissipating, the frustration and angst among those who step on a plane everyday. is this plane perhaps in that northbou northern arc. why are we not searching up there. was the plane possibly hijacked? did the pilot do something with this plane? was there catastrophic electrical failure? fire on board? did something cause it to be depressurized and cause it to be