Stratolaunch completed a successful third test flight of its Roc carrier aircraft, the world’s largest aircraft, this week.

The flight took place on January 16 and lasted 4 hours and 23 minutes over the Mojave Desert. Roc, named after a mythical bird of prey, reached an altitude of 23,500 feet at an indicated airspeed of 207 mph (333 km/h).

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