Two planes, including one that departed from Long Beach, were evacuated on arrival Sunday at Seattle-Tacoma International Airport due to what a spokesman called a "security concern."
JetBlue spokesman Sebastian White said JetBlue Flight 1006 from Long Beach, California, arrived about 4:15 p.m. to a remote parking stand where passengers and their belongings were rescreened.
All passengers and both planes were cleared by 6 p.m., SeaTac police said.
White said 150 passengers were aboard the plane, along with a crew of five.
The second plane was identified by police as Sky West Delta Flight 4741 from Phoenix.
SEA spokesman Perry Cooper said that out of an abundance of caution, passengers were evacuated on or near the airport's third runway and then bused to their gates.
He said the matter was under investigation and he did not have further details.
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Also Sunday, a Delta Air Lines plane bound for Florida was grounded in Texas after a bomb scare.
The Associated Press contributed to this report.