Performing barrel roles and flips before a fatal crash on the Ketron Island.
Wayne and Sharon Dequer, Ketron Island residents for the past five years, knew something was wrong as soon as they heard the plane.
Gov. Jay Inslee said in a statement fighter pilots flew alongside the plane "and were ready to do whatever was needed to protect us".
The air drama was broadcast live over air traffic control monitoring sites. Just a broken guy.
At one point, he apologizes and says he is a "broken guy" with "a few screws loose".
The pilot marvels at the beauty of the Olympics. "Can this thing do a black flip thing?".
"He was a nice guy", Kaelin said.
Ground control advises him to wait. "I'm down to 2,100 (pounds)", he is heard saying.
"There is the runway just off to your right side in about a mile", the controller told him.
The wooded area is hard to access, and because there are no fire engines on the island, everything has to get to there via ferry, Adams said.
"There is a protocol to not allow anyone singularly to get onboard an aircraft", CNN safety analyst David Soucie said. They also said he didn't have a pilot's license, and that it is unclear how he attained the skills to do loops in the aircraft before crashing about an hour after taking off.
Alaska Airlines on Twitter said the airplane was a turboprop Q400 airplane belonging to its sister carrier Horizon Air.
"We are aware of an incident involving an unauthorized take-off of a Horizon Air Q400".
"Okay this insane. A pilot on the plane in front of us just went rogue and took off on an empty plane bypassing orders from the tower", tweeted Ben Schaechter, a passenger on an airplane that was taxiing to take off before the incident.
"Last night's event is going to push us to learn what we can from this tragedy so that we can ensure this does not happen again at Alaska Air Group or at any other airline", said Brad Tilden, CEO of Alaska Airlines.
"We have multiple 911 calls, over 30, reporting a fireball", Troyer said.
The plane went through some extreme aerial maneuvers, including what appeared to be a loop-the-loop captured on video by an observer on the ground.
"Oh, Richard", the controller responds. "We are sending resources and people".
Two f-15 fighter jets were scrambled from Portland to intercept the stolen aircraft.
A plane has crashed near Sea-Tac airport in Seattle after being stolen by an airline worker and perused by F-15 fighter jets.
There was no connection to terrorism and no others were involved, said Troyer.
Audio captured between the man - who was identified as "Rich" - and air traffic controllers show him asking for help to get the cabin pressurised so he would stop feeling so lightheaded.
According to the Seattle Times, air traffic control, who referred to the man by what is believed to be his first name, tried to encourage him to land. "It's going to disappoint them to hear that I did this", the employee said to controllers.
The pilot, he said, got on the intercom to say another pilot had taken off ahead of them without permission. "Never knew it, until now".
"I was walking past Chambers Bay and I saw the jets coming down to the trees very close ..." a witness told KIRO 7.
"In this plane, he certainly knew how to retract the landing gear; he coordinated both engines, powered them up to get a coordinated takeoff", she said.
"It was unfathomable, it was something out of a movie", he told the newspaper.
This is a developing story, more information to come. Check back for updates.