What service used horses to carry mail across the American west?
Mail bag They are usually used for transporting First-class and registered mail to and from different post offices. Mail pouches also carry military domestic and military airmail. A catcher pouch was a mail bag used only by the Railway Post Office in exchanging mail when the train did not stop at the town. It was most popular in the late nineteenth century and the early twentieth century. A mochila was a removable lightweight leather cover put over a horse saddle for carrying mail and was used by the Pony Express. A portmanteau was a traveling suitcase used as a mailbag in the
Mail plane Mail plane A mail plane is an aircraft used for carrying mail. Aircraft that were purely mail planes existed almost exclusively prior to World War II. Because early aircraft were too underpowered to carry cargoes, and too costly to run any "economy class" passenger-carrying service, the main civilian role for aircraft was to carry letters faster than previously possible. In 1934, some mail services in the USA were operated by the United States Army Air Corps, soon ending in the Air Mail scandal. In the past, mail-carrying aircraft had to carry a special official emblem on the fuselages; in case