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Which U.S. president was the first to fly while serving in office?

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Mount Rushmore and Air Force One — Air Force One Air Force One, a Boeing 747 reserved for use by the president of the United States, flying over Mount Rushmore, South Dakota.

The first American president to fly while in office was Franklin D. Roosevelt. In January 1943, during World War II, he traveled to the Casablanca Conference in Morocco aboard a commercial Boeing 314 Clipper flying boat.1