Former JetBlue captain Clayton Osbon, who's still sitting in a Texas jail, has decided to plead not guilty by reason of insanity to charges of interfering with other flight crewmembers, according to a court motion filed by his attorney last week. Osbon's first officer locked him out of the cockpit of his Airbus A320 on March 27, after the captain's actions had caused the first officer to fear for the safety of the flight. A number of off-duty law enforcement officers sitting in the cabin managed to subdue Osbon until the aircraft landed safely in Amarillo with the help of an off-duty JetBlue pilot. The former captain's claim of insanity is still to be determined by a mental-health professional.