(USA TODAY) -- Flight attendants are used to flying in airplanes, but not many have flown outside of them.
United Airlines flight attendant Sabrina Swenson did just that to celebrate her 50th birthday, according to a blog post she wrote for the airline's website.
The Frankfurt, Germany-based attendant said she first took to the skies on the outside of an aircraft eight years ago, when the only wing-walking operation open to nonprofessionals was based in London. At that time, she was strapped into a standing position on top of a Boeing Stearman biplane before taking off.
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