CNN CNN International May 7, 2015 05:06:00
From descending it into the ground, making sure that nobody would see him. >> according to the report, the selected alty due decreased to 100 feet for three seconds and then increased to the maximum value of 49,000 feet. less than two minutes later, the selected altitude was 100 feet until it stabilized at 25,000 feet. the flight never left its scheduled path, so air traffic control didn't notice the altitude changes. >> the less the plane is equipped to stream the data and they decide to stream the data of the performance from the flight and someone is monitoring it, they wouldn't have notice...
Source: archive.org