They called a second alarm, Adams said, to get more crews out to the island. "They probably got anti-aircraft!" "If he had the skill set to do loops with a plane like this, he certainly had the capacity to fly it into a building and kill people on the ground", he said.
Video footages also shows Mr Russell doing loops in the plane.
Investigators on Saturday will try to retrieve the plane's flight data recorder and its cockpit voice recorder. "People need to realize that flying an aircraft is not hard, flying it correctly is the hard part". Southers is director of homegrown violent extremism studies at the University of Southern California.
Richard "Beebo" Russell, a Horizon Air ground service agent, flew the plane for over an hour before it crash-landed on Ketron Island in south Puget Sound on Friday. Video shows him doing large loops and other unsafe maneuvers.
The aircraft took off and began manoeuvering over Puget Sound.
"I don't know man", Rich said.
President Donald Trump has been briefed on the man who stole a plane from Sea-Tac International Airport in Seattle before crashing it into a small, nearby island. He is now at his New Jersey golf club. The identity and condition of the pilot are not known.
Pierce County Sheriff's spokesman Ed Troyer told the Bellingham Herald that information was preliminary regarding the developing incident.
SeaTac Airport was temporarily grounded amid a security threat.
Officials said Saturday that the man was a 3.5-year Horizon employee and had clearance to be among aircraft, but that to their knowledge, he wasn't a licensed pilot.
Authorities say there is no connection to terrorism and they do not believe anyone else was on the plane.
A Horizon Air Bombardier Q400 - like the one stolen -taxis toward the runway at Seattle-Tacoma International Airport. I would like to apologize to each and every one of them.
"Rich" explains that he had put some fuel in the plane "to go check out the Olympics", but then anxious that he was low on gasoline.
"I understand you have a lot of questions but our investigation aims to be thorough", Dietrich-Williams said via email.
Pierce County Sheriff said the hijacking was not a "terrorist incident".
A witness on the ground, Bryan Sichley, said he was at Chambers Bay in Tacoma and saw a plane nose dive after being chased by two fighter jets. There were no passengers aboard.
"The setup in aviation in America is we secure the airfield and then we have the mindset that we have employees that are credentialed and authorized to be there", Tilden said, adding that the airline was working with authorities to investigate.
On Saturday, airline and Sea-Tac representatives said Russell, who identified himself as "Rich" to air traffic controllers, was fully credentialed and had access to the cargo area where the plane was.
Alaska Airlines and other planes sit on the tarmac at Sea-Tac International Airport Friday evening, August 10, 2018, in SeaTac, Wash.
The airline was coordinating with the Federal Aviation Administration, the FBI and the National Transportation Safety Board, he said.