Allen's goal for the company and its namesake aircraft was to "provide convenient, reliable, and routine access to low-Earth orbit."

stratolaunch
YouTube / Stratolaunch

It will do so by launching rockets toward space from mid-air, which the company hopes will be less expensive than current commercial space-launch options.

stratolaunch
YouTube / Stratolaunch

See also: Apply here to attend IGNITION: Transportation, an event focused on the future of transportation, in San Francisco on October 22

That would be particularly useful for companies who want to send satellites into space. Allen wanted to eventually launch a rocket the size of a NASA space shuttle from the plane.

stratolaunch
YouTube / Stratolaunch

Its 385-foot wingspan makes it wider than a football field, and the larges airplane by wingspan.

stratolaunch
YouTube / Stratolaunch

The aircraft is 238 feet long, 50 feet tall, and has six high-bypass-ratio turbofan engines.

stratolaunch
YouTube / Stratolaunch

It weighs 500,000 pounds and needs 28 wheels between its two fuselages.

stratolaunch
YouTube / Stratolaunch

The aircraft made its first flight on April 13.

Stratolaunch first flight
Stratolaunch

It flew for over two hours.

Stratolaunch first flight
Stratolaunch

It reached a top speed of 189 mph.

Stratolaunch first flight
Stratolaunch