Flying slightly higher than a standard airliner, the aircraft known as Air Force One, or VC-25, is much more than a modified Boeing 747, even though they look almost identical from the outside. Inside, the VC-25 is a flying fortress, a command center, and one of the most secure environments on Earth. While much attention is often given to its communications systems and defensive capabilities, the engines that power the aircraft are equally critical to its mission. These engines are engineered to ensure survivability, endurance, and reliability under the most extreme circumstances imaginable.

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