In which year did the first successful circumnavigation flight occur?

The first successful circumnavigation flight occurred in 1924. This monumental achievement was completed by the United States Army Air Service in a campaign involving four Douglas World War I aircraft, known as the "Chicago Expedition." The expedition faced numerous challenges, including adverse weather conditions and the limitations of early aviation technology, but despite these obstacles, the crews meticulously navigated their aircraft over varying terrains and across oceans to successfully circle the globe.

This achievement marked a significant milestone in aviation history, demonstrating the advancements in aircraft design and the capabilities of aerial navigation, paving the way for future long-distance flights and international travel. The successful completion of this flight underscored the potential of aviation to connect distant parts of the world, and it captured the public's imagination about the possibilities of air travel.