Retired Malaysia Airlines pilot Captain Nik Huzlan has flown missing flight 370 and has known the Boeing 777's pilot Zaharie Ahmad Shah for 30 years and tells CNN's Kyung Lah that he does not believe that it was a catastrophic mechanical failure or the pilot - that led to its disappearance.
"From the second and third day I came to my own private conclusion that there must be some form of unlawful human interference," Huzlan said.
Watch Erin Burnett OutFront at 7pm ET for more of our interview with the former Malaysian pilot.
How do we know that someone on the ground, got into the computer part of the cargo bay before the plane lifted off. He remained hidden there until in the air, then started fooling with the controls -first turning off the communications, then programming a different flight plan. The pilots, in this scenario, would be heroes, trying to fight this or change it, or maybe even going into the cargo area and finding him.