Microsoft co-founder Paul Allen unveiled the world’s largest aircraft on Wednesday.

The massive plane rolled out by Allen’s aerospace firm, Stratolaunch Systems, features the longest wingspan of any aircraft ever built, according to Popular Mechanics.

With a wingspan of 385 feet, the six-engine plane will be larger than Howard Hughes’ 1947 H-4 Hercules, known as the ‘Spruce Goose,’ and the Antonov An-225, a Soviet-era cargo plane originally built to transport the Buran space shuttle that is currently the world’s largest aircraft.

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