My original theory (posted in another place) was that this is crime copied from the Adventures of Tintin - Flight 714.
Aboard the aircraft, the hijackers were qualified pilots in disguise
who took over the plane and immediately put the plane into a steep dive to get below the radar.
They then headed for a deserted island on which their accomplices had constructed a temporary air strip fitted with arrester gear. It was only just long enough.
The plane was then hidden. Unfortunately for the villains they were abducted by space aliens before they could complete their evil scheme, Tintin & co were released with no memory of the incident.
It all happened in the same region, too: