Increased summer travel is responsible for delays at Seattle-Tacoma International Airport security lines, the airport and Transportation Security Administration said, according to The Associated Press.
About 150 passengers have missed flights on Alaska Airlines since Sunday because of waits of more than an hour in security lines, airline spokeswoman Marianne Lindsey said.
“Summer travel season is on,” she said.
The airline is sending text messages to travellers advising them to prepare for an hour at security checkpoints, she said.
The worst times are between 4 p.m. and 9 p.m. when Alaska has 60 flights departing. Alaska is the largest single carrier at Sea-Tac.
The airport advises passengers to arrive two hours early, said spokeswoman Christina Faine.
SeaTac averages about 100,000 passengers a day from June through August, compared to about 85,000 off-season.