It crashed near Ketron Island in Pierce County, the airline tweeted, adding that "we believe" nobody besides the man was on board.
It's unclear how he attained the skills to do loops in the aircraft before crashing about an hour after taking off into a small island in the Puget Sound, authorities said.
Kethleen Reichel said she watched the planes pass by for about two minutes.
Toward midnight on Friday, the investigation was handed off to the FBI, which was working with the National Transportation Safety Board, the Federal Aviation Administration and other agencies, the Seattle Times reported.
Tilden said the system in place is to credential and secure employees and air fields, but not planes.
"In this season of life, we enjoy exploring as much as possible, whether its a day (or so) trip to one of Alaska Airline's destinations or visiting a new area of Washington", he wrote.
Mike Mathews, a friend of Russell, said at a press conference the incident came as a "complete shock". We know who he is.
The FBI's special agent in charge of the Seattle office, Jay S. Tabb, said up to 40 FBI agents were working the case overnight.
One colleague said, "People did not see him as a threat".
Pierce County Sheriff's spokesman Ed Troyer told the Bellingham Herald that information was preliminary regarding the developing incident.
A plane flies past a control tower at Sea-Tac International Airport Friday in Washington. There were no passengers aboard.
Airline and airport officials would not say during a briefing to reporters Saturday exactly when airport staff determined the plane was in the process of being stolen.
Premier League Top 5 Summer Transfers With transfer business now done and dusted, clubs are now well poised to settle down to the task of posting a good outing in the Premier League this season.
Richard Bloom, an aviation security expert at Arizona's Embry-Riddle Aeronautical University, said he wasn't aware of another incident in which a ground crew member managed to heist an airplane.
"To my knowledge, he didn't have a pilot's license", said Horizon CEO Gary Beck. They pursued the aircraft before it went down on Ketron Island, between Tacoma and Olympia.
While authorities did not release the man's name, they say the man was suicidal, and officials said Friday night the man is likely dead.
The aircraft was stolen about 8 p.m. Alaska Airlines said it was in a "maintenance position" and not scheduled for a passenger flight.
The US fighter jets chased the planes to divert the Horizon Air Q400 from the crowded area after the airline employee conducted an unauthorized takeoff without passengers. Ultimately, the man crash landed the hijacked Horizon Air Q400 plane after being coaxed by air traffic controllers, but audio and witness accounts paint a disturbing scene. Got a few screws loose, I guess.
An airline mechanic stole an airplane at Seattle-Tacoma International Airport on Friday (Aug 10) and was chased by two U.S. military jets before crashing on a nearby sparsely populated island, the local sheriff said.
"Oh man", Russell says, "Those guys will rough me up if I try and land there. It's going to disappoint them to hear that I did this", Rich said.
At one point, he said: "Hey do you think if I land this successfully Alaska will give me a job as a pilot?"
As of now, no other people have been reported hurt, and the airport has resumed normal operations.
The crash sparked a fire in the dense forest.
During the conversation, Russell said he had put some fuel in the plane "to go check out the Olympics" - the Olympic Mountains that lie about 100 miles (160 kilometers) away.
They are looking to build on an appearance in last season's Champions League final and back-to-back finishes in the top four. We beat Manchester City in the league and the Champions League last season, so I think we can win everything in the world.
But Mustangs soon will be one of only two passenger cars from Ford - along with a crossover Focus - sold in North America. Ford is celebrating a massive milestone after its 10,000,000th Mustang rolled off the production line in MI yesterday.
However, the new store will be different from Steam's , which has become a platform where nearly anyone can sell a game. Discord has launched a beta for what's being called the Discord Store, a place where users can purchase games directly.
The Marvel , DC and Star Wars movies all regularly pull in north of $700 million if they don't reach $1 billion worldwide. Leonard "Bones" McCoy in the Kelvin timeline Star Trek films, responded to Spiner, taking the overly-literal approach.
Manigault Newman also describes Trump as a man who "loved conflict, chaos and confusion; he loved seeing people argue or fight". Chait points to the a Politico story in which White House staffers say they are unwilling to take her on.
No evidence has been presented by either side to prove or disprove that funding had been secured to take the company private. Such investors have always been an irritant for Musk, who has sometimes used Twitter to criticize them.
Michael Keane rose highest the ball pinballed off a defender before allowing Richarlison to bang home into an empty net. Cenk Tosun and Jimenez exchanged missed efforts before Everton regained the initiative after 67 minutes.
Her latest stop had brought her along with friends to NYC , in what was presumably supposed to be the trip of a lifetime. A witness told New York Daily News that the Lyden did not appear to be wearing a helmet when she was struck by the truck.
I made an adjustment over at 17, I wanted to make sure I got this to the hole and then I blow it by 4 feet and then miss it. I said to my caddie a couple of holes before it was the most fun I'd ever had and then that happened.
Both his 66s were compiled in the same fashion, shooting 31 for the front nine and 35 blows for the inward half. He hit his approach 20 feet above the hole and didn't know a record was at stake - until after he missed.
The White House has a tanning bed, although the Post reports that other White House aides have said they have not seen it. Elsewhere in the book, Manigault Newman paints an unflattering portrait of Ivanka Trump, the president's elder daughter.
President Donald Trump and others have criticized the players, saying their protests are unpatriotic and disrespect the military. Numerous players, from different teams, wanted to show their "outrage" at something that a lot of them are unable to define.
Chelsea blank Huddersfield in Sarri's debut
MF Ruben Loftus-Cheek, 6 - Replaced Barkley in the 68th minute and brought a more physical presence to Chelsea's midfield. However, they will certainly need to be more clinical and penetrative if they are to build on last season's fine work.
Blade Runner's Sean Young wanted for questioning by NYPD
She is best known, in addition to " Blade Runner ", for her roles in " Dune " and " Ace Ventura: Pet Detective ". Actress Sean Young could be in trouble with the NYPD - they want to question her about a brazen daytime robbery.
Sarri not aiming to repeat Napoli formula at Chelsea
When asked how long it could take for his players to be at their best, Sarri surprised many with his response. Jorginho will clearly be the key, the expert at quickly shifting the ball that Sarri knows well from Napoli.
News Corp tops estimates as Foxtel, books unit drive gains
Digital revenues represented 30% of News and Information Services segment revenues in the quarter, compared to 26% a year ago. The growth was partially offset by lower print advertising revenues at the news and information services segment.
Changes to ICBC premiums would see bad drivers pay more
Discounts for seasoned drivers will be extended to reflect up to 40 years of experience, up from the current limit of nine years. It is built around ensuring the vehicle rather than the driver and allows discounts to drivers despite multiple crashes.
Derby sign Malone from Huddersfield
And the impressive victory was achieved with 10 of the same players who could not get Leeds into a top half finish last season. Leeds, after two incredible wins under Bielsa, are now favourites to win the league themselves.