applying with the airline for more than ten years. what could have gone wrong? critical could answering that will be the debris and the black boxes. tonight this is the challenge pg rocky terrain first responders and investigators are navigating, germanwings flight 9525 with 150 people went down in the snowy french alps with peaks as high as 10,000 feet. what seemed like a routine flight from barcelona to dusseldorf turned deadly. it took off at 10:01 local time. tracking site showed the plane climbed to a cruising altitude of 38,000 feet but only stayed there for about three minutes before starting an unplanned descent. >> it seems to me that it was still a controlled descent. >> reporter: 45 minutes after takeoff, the airline's ceo says the plane held at 10,000 feet for about a minute. eight minutes later, air traffic controllers lost contact with