NASA Proteus aircraft in flight
50th largest aircraft: The Proteus was built by Scaled Composites and is actually called the Model 281.


The Proteus was first designed by Burt Rutan to research use of aircraft as high altitude telecommunications relays, but has done other missions and carries many payloads. They can go up to 60,000 feet above the surface and can fly for up to 17 hours. Now owned by Northrop Grumman, the Proteus now flies piloted and remotely at speeds of up to 120 mph with it's 2 jet engines and have set over 6 world records.

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The NASA test Proteus.