The Travel Air Type R "Mystery Ships" were a series of wire-braced, low-wing racing airplanes built by the Travel Air company in the late 1920s and early 1930s. They were so called, because the first three aircraft of the series (R614K, R613K, B11D) were built entirely in secrecy. The fourth Type R, NR-1313, purchased by the Texaco Company for Frank Hawks as "Texaco 13" became the most famous of the series, setting numerous long distance records both in the United States and internationally. After Hawks toured the European continent, a fifth Mystery Ship, 11717/MM185, was built for the Italian government as a "model" for the indigenous aviation industry. The last Type R was built by Travel Air after it had been absorbed by Curtiss-Wright. "Texaco 13" is now displayed at the Museum of Science and Industry (Chicago).