The Martin XT6M is an aircraft designation that lacks historical attestation within the documented records of the Glenn L. Martin Company. Extensive reviews of archival materials, including the Smithsonian National Air and Space Museum's Martin Aircraft Company collections and the Centennial of Flight history, reveal no mention of an XT6M model. While the Glenn L. Martin Company was a prolific producer of military and civil aircraft, this specific designation does not appear in standard reference lists of the manufacturer's output.
The Glenn L. Martin Company, founded by Glenn L. Martin on August 16, 1912, in Los Angeles, California, established a significant legacy in aviation. The company's early operations began in Santa Ana before expanding to Cleveland, Ohio, where it became a primary supplier for the U.S. Army and Navy. In 1929, the company relocated its headquarters to Middle River, Maryland, to accommodate growing military contracts. Throughout its history, the firm produced several landmark aircraft, such as the B-10—the first modern all-metal monoplane bomber with an internal bomb bay—and the B-26 Marauder, known for its high speed during World War II. Other notable designs included the PBM Mariner and JRM Mars flying boats, as well as the M-130 "China Clipper" used by Pan American Airways.
Despite the company's extensive portfolio, there is no evidence of a prototype or production run for the XT6M. Technical specifications, engine details, and performance figures for such a model are non-existent in primary source documentation. The company eventually transitioned from aircraft manufacturing toward guided missiles and space exploration, producing the Titan missile series. In 1961, the Martin Company merged with the American-Marietta Corporation to form Martin Marietta, which subsequently merged with the Lockheed Corporation in 1995 to become the modern aerospace entity Lockheed Martin. Because the XT6M is not recognized in any official capacity, it holds no place in the established design lineage of the Glenn L. Martin Company.