train in altitude chambers..I bet military pilots do... I think we can rule out eokhokie's question about did someone do something bad on the plane. Grandma, 2 year-old, and nanny?? Long odds they were causing trouble. He also mentioned alcohol. This was the guys personal pilot. Any pilot I've ever known is adamant about drinking and flying.. be hard for a personal pilot to hide it (harder than commercial IMO). That size Cessna jet is not required to have a black box, but could have....Heard autopilot would likely have been programmed to Long Island and back to TN where it came from. THAT would explain the uturn and flight back from whence it came (but doesn't explain how it made a straight line over DC into restricted air space. All very sad, and strange! Many questions