Aft and Mid APAS X-37B Configurations
These designs from a Boeing study show configuration for a crewed space plane (X-37C) derived from the unmanned X-37B spacecraft. The designs could carry up to six astronauts to low-Earth orbit and include autonomous and piloted flight capabilities.
X-37B Size Comparison
This size chart shows how the Boeing-built X-37B robot space plane compares to NASA's space shuttle, a larger version of the spacecraft called the X-37C and an Atlas 5 rocket.
This Boeing graphic depicts the steady evolution of the robotic X-37B space plane design into a larger vehicle that could potentially carry astronauts. The process incrementally retires risk as capabilities increase, according to Boeing officials.