There are 600, 000 private airplanes in the U.S., and the pilots of 95% of them wear noise cancelling headsets when flying.
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The problem is that these switches wear out, they get crushed by flying "air balls", or they are knocked and bent out of position.
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Even when nothing is moving or flying, the sound of machines is always audible over the performers, who wear oversized microphones to deliver their lines.
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