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- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, makes its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, makes its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- Heavy black smoke rises from one of the six engines starting, before the first test flight of the world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, lands during its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, makes its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, makes its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, makes its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, makes its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- The world's largest airplane, built by the late Paul Allen's company Stratolaunch Systems, takes off on its first test flight in Mojave, California, U.S. April 13, 2019. REUTERS/Gene Blevins
- El Stratolaunch, un gigantesco avión de seis motores con la envergadura de alas más larga del mundo, inicia en California su primer vuelo el sábado 13 de abril de 2019. (AP Foto/Matt Hartman)
- Stratolaunch, a giant six-engine aircraft with the world’s longest wingspan , makes its historic first flight from the Mojave Air and Space Port in Mojave, Calif., Saturday, April 13, 2019. Founded by the late billionaire Paul G. Allen, Stratolaunch is vying to be a contender in the market for air-launching small satellites. (AP Photo/Matt Hartman)
- Stratolaunch, a giant six-engine aircraft with the world’s longest wingspan , makes its historic first flight from the Mojave Air and Space Port in Mojave, Calif., Saturday, April 13, 2019. Founded by the late billionaire Paul G. Allen, Stratolaunch is vying to be a contender in the market for air-launching small satellites. (AP Photo/Matt Hartman)
- Paul Allen, co-founder of Microsoft Corp., sits behind a model aircraft during a news conference for the launch of his new venture Stratolaunch Systems Inc. in Seattle, Washington, U.S., on Tuesday, Dec. 13, 2011. Allen said Stratolaunch Systems Inc. will bring 'airport-like operations' to space flights, including eventual human missions. The first flight is planned within five years. Photographer: Kevin P. Casey/Bloomberg via Getty Images