First successful around‑the‑world flight.
On April 6, 1924, 4 teams of pilots from the United States Army Air Service set out from Seattle, Washington in an attempt to circumnavigate the world. The 4 Douglas World Cruiser planes were named Seattle, Chicago, Boston, and New Orleans. 175 days later, Chicago and New Orleans touched down in Seattle – Boston and Seattle did not complete the 27,550-mile journey around the world.