Another summer travel season is approaching and along with it some changes in the skies. United will soon become the first airline to install a retractable metal barrier outside the cockpit. Although the airlines strengthened cockpit doors after Sept. 11, United is putting in the new layer of protection for times when the flight deck has to be opened. Meanwhile, an array of new gadgets and services is on the market, aimed at helping flyers deal with crowds and security hassles. --By Sally B. Donnelly
KNEE DEFENDERS Two plastic devices fit on your tray table to keep the seat in front...
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