trying to understand what the particular noises were. could it be a power up we simply don't know. what we do know and what mikey kay has very credibly reviewed is a that this aircraft didn't offer any distress signals and descended in a controlled fashion. between 38 and 42,000 feet the pilots have only a few seconds to don their oxygen masks if there's an explosive decompression, for example. did that happen? could that have happened? that is one possible scenario. we don't want to suffer from investigative bias another possible scenario is a terror or criminal act. there have been approximately 18 a-320s accidents since the inserpgs of the aircraft. >> we want to make sure we're