• The aircraft has 385-foot wingspan and, powered by six Pratt & Whitney engines used on Boeing 747 aircraft, has a maximum takeoff weight of 1.3 million pounds.
• The Stratolaunch's wingspan is the largest in history, blowing away the previous record-holder (Howard Hughes' Spruce Goose) by 65 feet.
• Vulcan Aerospace says its Stratolaunch airplane will have an operational range of 2,000 nautical miles. Serving as a reusable first stage for rocket launches, the Stratolaunch system will be capable of delivering payloads to multiple orbits and inclinations in a single mission.

Source: Paul Allen showed off his new rocket-launching plane today, and it’s BIG