US authorities are investigating the Friday night crash of a Horizon Air Q400 aircraft near Seattle-Tacoma airport in Washington state after an airline employee took off without clearance and flew the plane for about an hour before it crashed.

Two F-15 military fighter jets went up into the air in order to intercept the stolen airliner, and the airport closed for a short time.

There were no passengers on board except the person who was operating the plane. It is believed that he is Richard Russel, a 29 year old local man who worked for the airline. Some media images showed the aircraft doing complicated and dangerous flying before crash. In an audio recording a conversation with an air traffic controller, the person piloting the aircraft said he was a “broken guy”.

Adapted from news.airwise.com/story/airline...

In “the person piloting the aircraft said he was a broken guy (...)”, you can infer that the man was ___________, EXCEPT: