Stratolaunch completed two flights of its autonomous Talon-A2 rocket plane earlier this year, as the US aims to gain ground in its race for hypersonic supremacy with China.
A successful reflight of SpaceX's Super Heavy booster would be an important milestone for its Starship program.
The core stage of NASA’s Space Launch System is now integrated with the rocket’s twin boosters.
The new version of Starship will be tested again in four to six weeks. A third consecutive failure could indicate fundamental problems with the updated design.
