Video report from ITV News Correspondent Dan Rivers
ITV News went up into the air to see how easy it would be for a plane to disappear off the radar after Malaysian authorities said they are focusing on the theory that a "deliberate" action was behind the disappearance of flight MH370.
Dan Rivers travelled in a light aircraft 5,000 feet above Hampshire to see how easy it would be for a Boeing 777 to vanish from a radar.
In a pre-arranged demonstration with Air Traffic Control, Pilot Robin Durie turned off the plane's transponder which left the aircraft anonymous on radars.
If a pilot turned off the transponder, descended and then hid behind high ground, the aircraft would completely vanish from radars.
However, a former RAF Tornado pilot told ITV News that although this was possible for an experienced pilot to perform, it would be a manoeuvre fraught with problems.