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Trump's hugely anticipated Davos speech looks set for a delay after Air Force One had to turn around
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Photos show the luxurious, heavily fortified presidential jets world leaders use for official travel
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US Air Force photo by Jim Copes
The number of private jets operating around the world has more than doubled since 2000, tracking closely with the global surge in billionaires. Now private airlines are coming up with new ways to get customers hooked. Here's a look at the rise of the $40 billion industry.
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