Not sure if this is Hangar Flying or Space, but let’s go for the latter.
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.
So for saving money/fuel on Stage 1 boosters. It’ll be interesting to see how the economics stack up to something like a SpaceX Falcon 9. Would be fun to fly this big guy in FSX/XP11/P4D etc.