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WATCH: Paul Allen’s Stratolaunch plane hits 46 mph

The world’s largest airplane being developed by Stratolaunch Systems reached a runway speed of 46 mph during the latest test.

Crews conducted a taxi test of 385-foot-wide aircraft over the weekend.

Stratolaunch Systems, a space launch venture, is backed by Microsoft co-founder Paul Allen.

The aircraft could begin orbital launches as early as 2020.

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