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April 3, 1933
Lord Clydesdale and David McIntyre undertook the first successful flight over Mount Everest.

Douglas Douglas-Hamilton, 14th Duke of Hamilton
Air Commodore Douglas Douglas-Hamilton, 14th Duke of Hamilton and 11th Duke of Brandon, was a Scottish aristocrat, politician and aviator. He was the first man to fly over Mount Everest.
Houston–Mount Everest flight expedition
The first flight over Mount Everest was undertaken in April 1933 by two Westland aircraft. They were piloted by Douglas Douglas-Hamilton and David McIntyre, with Stewart Blacker and Sidney Bonnett in the observer seats. The expedition was financed by Lucy, Lady Houston and led by Peregrine Fellowes.