X-1, NASA history collection. Public domain image of NASA aircraft.

E-9XS-1 on the ramp with the B-29 mothership in 1949. This is the second XS-1 built; it later was converted into the X-1E. Unlike the XS-1-1, which was flown by the Air Force, the XS-1-2 was flown mostly by Bell and NACA pilots. It gathered much more research data than the more famous XS-1-1, known as ''Glamorous Glennis.'' 1949 NASA Photo / NASA B-29 Project Description
NASA Identifier: 340534main_E-9