It's been nearly 25 years since 9/11, when terrorists hijacked commercial jetliners and turned them into weapons of mass destruction. Now, after years of delays, new secondary barriers protecting airline cockpits are beginning to take flight.

Inside a Southwest Airlines hangar at Phoenix Sky Harbor Airport, CBS News was given an early look at the airline's brand-new Boeing 737 MAX with the secondary barrier.

It's essentially a retractable folding door that blocks off the front galley and flight deck. It aims to be a more secure option than flight attendants blocking the area with a beverage cart.

A secondary barrier protecting the cockpit on a Southwest flight. Southwest Airlines

"This is kind of the latest edition to provide an additional layer of protection anytime our pilots need

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