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America's Out-of-This-World Museum A buoyant celebration of things that fly, the Smithsonian Institution's National Air and Space Museum is the capital's most popular attraction BY RALPH KINNEY BENNETT THE GRAY-HAIRED WOMAN remembers when she was a girl in Connecticut, getting canning jars out in the garage. She heard the throbbing noise, sensed the shadow and ran out on the lawn to see a Ford Tri-motor fill the sky above the tall sycamores. A middle-aged salesman from Ohio recalls the weight of the long belts of 50-caliber ammunitions slung around his shoulders as he serviced [page break] PHOTOS: FRED J. MAROON/ LOUIS MERCIER [Image Caption] Leading a parade of historic airlines, the rugged, venerable Ford Tri-motor 199