The giant double-decker is closing in on two decades of service.
Look in The Past on MSN
America built a massive bomber - then the war changed everything
The Douglas XB-19 was one of the largest aircraft built in the United States before World War II. Designed as an experimental long-range bomber, the aircraft was enormous for its time. Its wingspan ...
This month will see a total of more than 7,000 flights.
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