"Doing stunts in air or lack of flying skills caused crash into Island", the sheriff said on Twitter.
Sheriff's department officials said they were working to conduct a background investigation on Mr Russell.
An airline employee "conducted an unauthorised takeoff" of an airplane carrying no passengers at the major airport in the northwestern U.S. state of Washington, airport officials said on Twitter.
Jeremy Kaelin said he worked with Russell, a ground service agent at Horizon Air, in 2016. That's why the F-15s got scrambled to deal with this issue, and it seems highly likely that they would have fired on the plane if it made any aggressive moves towards airports or cities.
The airport ground service agent also apologised to his friends and family, calling himself a "broken guy". I would like to apologise to each and every one of them. "Never really knew it, until now". "Pilots kept plane out of harm's way and people on ground safe", the sheriff said on Twitter. It did not elaborate.
"Oh man", Rich immediately responded, "Those guys will rough me up if I try and land there".
"I've got a lot of people that care about me". "We're not going to worry or think about that".
"I don't need that much help". "I'm down to 2,100 (pounds)", he is heard saying.
An air traffic controller tried to convince him to land the aeroplane.
"I don't know, man", the pilot answers. "You want me to ride the brakes in the cockpit" or 'Hey, what are you doing?' Nobody did that", said Kelly.
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The lengthy gameplay demo was part of a keynote delivered at Quakecon, the annual showcase for all things id (and Bethesda ). There was a claw of some kind that dug into surfaces, but we'll have to wait for more information in the near future.
Shortly before crashing into Ketron Island, Russell said he was hoping to "have this moment of serenity". The fuselage was fragmented and appeared to be upside down, said Debra Eckrote, regional chief for the National Transportation Safety Board.
The Bombardier Q400 turboprop is designed for short-distance flights and can seat 76 passengers, Alaska Air said.
"I want to thank the Air National Guard from Washington and OR for scrambling jets to keep Washingtonians safe", Washington Governor Jay Inslee tweeted.
"It was unfathomable, it was something out of a movie", a resident who saw the crash told The Seattle Times. The jets were armed but did not open fire, North American Aerospace Defense Command spokesman Cameron Hillier said by phone.
It was unclear where he got the skills to perform such manoeuvres, authorities said.
Two F-15 fighters were scrambled, about 75 flights were delayed and five fights were cancelled, authorities said. Unlike cars, there are no keys needed for the door or to turn on the plane, he said.
Witnesses described the surreal scene after the plane left the airport.
"Preliminary info is that a mechanic from unknown airlines stole plane".
Authorities in the Seattle area have confirmed the crash of a stolen commercial airline plane Friday night.
"N$3 o signs of what happened, that's for sure", Hayes said.
"It is highly fragmented", she said of the plane. "We have no indication of any casualties other than the person on the plane".