Acted alone he is 29 year old Pierce county residence.
There were no passengers aboard. Confirming this, the airport said, "No passengers were onboard during the incident and normal operations have resumed at the airfield".
Airline employee steals plane at Sea-Tac Airport, crashes on Puget Sound island
Two F-15 fighters were scrambled and all SeaTac flights were briefly grounded, the Tacoma News Tribune reported. Then he added, "T$3 his is a single suicide male".
Alaska Airlines also confirmed the plane had crashed near the island.
Alaska Airlines says it was aware of one of its planes taking off in an unauthorized way from the airport. 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.
"I've got a lot of people that care about me", he said at one point.
The US Coast Guard was sending a 45-foot vessel to the crash scene after witnesses reported seeing a large plume of smoke in the air, Petty Officer Ali Flockerzi said. "Preliminary info is that a mechanic from unknown airlines stole plane".
"We can see evidence of fire on the hillside here on this island", he said in a reporter standup.
"It was unfathomable, it was something out of a movie", he told the newspaper.
After taking off from Seattle-Tacoma International Airport, the hijacked plane crashed on Ketron Island.
Federal authorities were searching on Saturday for what drove an airline worker to steal an empty airplane from Seattle's airport and crashing it into a nearby sparsely populated island, sparking a security scare that saw USA fighter jets scrambled. "The Bombardier Q400 features 76 comfortable seats and boarding doors in both the front and rear of the plane for faster passenger loading and deplaning".