In 1924, the U.S. Army Air Service completed the first flight around the world, proving that long-distance aviation could connect continents and oceans. The expedition began in Seattle on April 6, 1924, and returned there on September 28 after 175 days. It showed the public that aircraft were becoming tools for exploration, communication, and military planning.
The journey also highlighted how much early aviation depended on teamwork, weather knowledge, navigation, and repair skill.
Key Facts
- The flight began on April 6, 1924, in Seattle, Washington, and ended there on September 28, 1924.
- The expedition covered about 26,345 miles in 175 days.
- Four Douglas World Cruiser aircraft began the journey: Seattle, Chicago, Boston, and New Orleans.
- Only two aircraft, Chicago and New Orleans, completed the full circumnavigation.
- Average speed can be found with v = d/t, where v is speed, d is distance, and t is time.
- The aircraft were open-cockpit biplanes adapted from the Douglas DT-2 and could use wheels or pontoons.
Vocabulary
- Circumnavigation
- Circumnavigation is a complete trip around Earth or another body.
- Douglas World Cruiser
- The Douglas World Cruiser was the modified biplane used by the U.S. Army Air Service for the 1924 around-the-world flight.
- Pontoon
- A pontoon is a float attached to an aircraft so it can take off from and land on water.
- Dead reckoning
- Dead reckoning is a navigation method that estimates position using direction, speed, time, and previous location.
- Logistics
- Logistics is the planning and movement of supplies, equipment, fuel, and people needed to complete a mission.
Common Mistakes to Avoid
- Assuming all four planes finished the trip is wrong because only Chicago and New Orleans completed the full route.
- Treating the 175 days as continuous flying time is wrong because much of the expedition was spent waiting for weather, repairs, refueling, and planning.
- Ignoring fuel and maintenance stops is wrong because early aircraft had limited range and needed frequent support to cross long routes safely.
- Thinking the route was a simple straight line is wrong because the crews followed paths shaped by weather, coastlines, available landing sites, and international support.
Practice Questions
- 1 The expedition traveled about 26,345 miles in 175 days. What was the average distance covered per day?
- 2 If one leg of the route was 850 miles and the aircraft averaged 85 miles per hour, how many hours would that leg take using t = d/v?
- 3 Why did the crews need both strong navigation skills and international logistics support to complete the first flight around the world?