system could be accessed or manipulated from its in-flight entertainment system. roberts has now stopped giving interviews, but on sunday tweeted my only interest has been to improve aircraft security. but there s widespread skepticism about his claim. recently retired commercial airline pilot jim tillman. the folks at airbus and boeing are far too smart to create some system like that. it s just ridiculous. reporter: tech writer bob sullivan is also skeptical, but there s a long history of computer hackers who are on the right side of things tinkering, maybe around the edges of the law, and we don t want to shoot the messenger here when the messenger has an incredibly important security problem to talk about. reporter: i m inside the cockpit of a plane owned by trinity air ambulance. they allowed us in here so we could show how advanced the cockpit has become these days. meantime, the gao has just released a report that says any