SEATTLE (AP) -- Alaska Airlines has begun begin installing crossbar locking devices on cockpit doors, officials of the West Coast regional carrier said.
The device, designed to hinder unauthorized access to the flight deck, was being installed on an MD-80 passenger jet Monday night. The principal component is a three-quarter-inch steel bar that can withstand a force of up to 1,500 pounds.
Installation on the rest of Alaska's 102 jetliners could begin later this week pending a final review and certification by the Federal Aviation Administration.
Investigators say hijackers forced their way into cockpits to take control of the American Airlines and United Airlines jets that slammed into the twin towers World Trade Center and the Pentagon and a fourth plane that crashed in Pennsylvania.
Alaska Airlines is the nation's 10th largest carrier and the largest in passenger traffic on north-south routes along the West Coast with service from Alaska to Mexico as well as flights to Chicago and Washington, D.C.
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