The phrase “List of X-1B flights” does not correspond to a widely recognized or independently documented encyclopedic entry. While the Bell X‑1 series, including the X‑1B variant, is a well‑known experimental aircraft program that achieved several notable flight milestones in the late 1940s, there is no dedicated, verifiable source that compiles a comprehensive, standalone list exclusively titled “List of X‑1B flights.”
The Bell X‑1B was a high‑altitude, rocket‑propelled research aircraft derived from the original X‑1, modified primarily for operations at extreme altitudes and for aerodynamic studies. Flights of the X‑1B were conducted by the United States Army Air Forces (later the United States Air Force) between 1949 and 1951, contributing to early supersonic and high‑altitude research. Individual flight records—such as date, pilot, altitude, and objectives—are occasionally referenced in historical aviation literature and specialized databases, but they are typically incorporated within broader discussions of the X‑1 program rather than presented as a separate, indexed list.
Consequently, the term “List of X‑1B flights” appears to be a descriptive label that could be used informally to denote a compilation of those specific flight entries, but it lacks an established, citable encyclopedic source. Any such list would likely be derived from primary flight logs, official Air Force archives, or secondary historical analyses rather than from a recognized reference work.