On Saturday, February 24 and Sunday, February 25 the Stratolaunch team performed taxi tests building on the first taxi test in December. The aircraft reached a top taxi speed of 40 knots (46 mph).
The tests were conducted at the Mojave Air and Space Port in California.
The aircraft has a wing span of 385 feet (117 meters).
The airplane will be used to air launch rockets.
The aircraft was built by Scaled Composites as part of a program being funded by Microsoft Co-founder Paul Allen.