How did Columbine III differ from Columbine II?

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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 Columbine II and Columbine III were both presidential aircraft used during the administration of Dwight D. Eisenhower. While the Columbine II was a customized C-121 Lockheed Constellation, the Columbine III was a modified Super Constellation that offered several upgrades.1

Specifically, the Columbine III differed from its predecessor by being:
* Longer1
* Faster1
* More comfortable1

The Columbine III replaced the Columbine II as the primary presidential transport in 1954 and holds the distinction of being the final piston-engined aircraft to serve in that capacity.1