"We are incredibly proud of the Stratolaunch team, today's flight crew, our partners at Northrup Grumman's Scaled Composites and the Mojave Air and Space Port", he added.
Saturday's flight, which saw the plane reach a maximum speed of 189 miles per hour and altitudes of 17,000 feet, was meant to test its performance and handling qualities, according to Stratolaunch. The plane is not just big for the sake of being big or to grab the record.
The Mojave Air & Space Port is located in California (the "Golden State") and is the first site which is licensed to horizontally launch reusable spacecraft from. The company did however detail a year ago some of the vehicles it will attach to the underbelly of the Stratolaunch.
The plane has a dual fuselage design and its wingspan is greater than the length of an American football field.
Until then, you can have a look at Stratolaunch's maiden flight in the video attached below. It would be a sight to see, right?
The mobile launch platform aims to enable airline-style access to space as its centre wing can support multiple launch vehicles, weighing up to a total of 500,000 pounds.
Allen, who co-founded Microsoft with Bill Gates in 1975, announced in 2011 that he had formed the privately funded Stratolaunch.
The pilots that flew the behemoth of an aircraft had to carry out a long to-do list including flight-control maneuvers and simulating landing approach exercises.
The Stratolaunch aircraft is created to act as a flying launch pad for satellites and put payloads in orbit.
"We all know Paul would have been proud to witness today's historic achievement", said Jody Allen, Paul's sister and chairwoman of Vulcan Inc., one of Paul Allen's companies. The plane was able to return to the ground safely after completing its maiden flight.