Good evening. Im lester holt sitting in for brian who will be back tomorrow. It is without a doubt the most baffling aviation mystery of our time, and it seems like everyone by now has a theory, a guess or opinion about what happened to Malaysia Airlines flight 370. After ten days the best investigators have been able to determine that the disappearance of the jet was a deliberate act and that it flew off somewhere in the northern or southern hemisphere. But the question of who is behind it has tonight cast suspicion on the pilots. Even as officials again today revised the time line of this mystery. Once again tonight tom costello leads off our expanded coverage. Any signs of this search scaling back . Reporter a little bit. The pentagon telling us it is preparing to reduce the u. S. Part of the search. The uss kidd will soon end Search Operations leaving only p8 and p3 aircraft to search massive areas of water. And with no other country finding any sign this plane was ever on radar, t