Stratolaunch Systems is owned by Paul Allen, who cofounded Microsoft.
Allen's goal for the company and its namesake aircraft is to "provide convenient, reliable, and routine access to low-Earth orbit."
It would do so by launching rockets toward space from mid-air, which the company hopes will be less expensive than current, commercial space launch options.
That would be particularly useful for companies who want to send satellites into space.
Its 385-foot wingspan makes it wider than a football field, and the larges airplane by wingspan.
The aircraft is 238 feet long, 50 feet tall, and has six high-bypass-ratio turbofan engines.
It weighs 500,000 pounds and needs 28 wheels between its two fuselages.
The aircraft needs to perform a series of tests before it can take flight.
The company most recently performed a runway test where the aircraft reached a maximum speed of 46 mph.
The Stratolaunch's first flight is scheduled for 2019.
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