On September 19, 1911, a French military airship named Adjudant-Réau set a new national record for the longest balloon flight. The airship stayed airborne for 21 hours and 21 minutes, traveling over 850 kilometers at an average speed of 53 kilometers per hour. This impressive feat was achieved under the command of Captain Surcouf, with a crew that included chief pilot Mugnier, assistant pilot Cohen, and mechanics Antoine, Fontaine, and Chéron. Three passengers, Legues, Valette, and Caussin, also joined the journey, adding to the adventure's significance. The Adjudant-Réau was a large airship, measuring 86.78 meters in length and 16 meters in width, with a volume of 8,950 cubic meters. This size allowed it to carry enough fuel and supplies for the long flight. The expedition began on September 18, 1911, when the airship took off at 5:10 p.m. from Issy-les-Moulineaux, a town near Paris. The destination was the Valley of Thillot, a region in the French Alps. After reaching the destination, the airship began its return journey, completing the flight on the following day. This achievement marked a significant milestone in early aviation history, showcasing the capabilities of airships for long-distance travel. However, the Adjudant-Réau's record remained below the world record set by the German airship Zeppelin II, which had stayed aloft for 36 hours and 30 minutes. Despite this, the flight of Adjudant-Réau was a notable accomplishment in the field of ballooning and contributed to the growing interest in air travel during the early 20th century. The success of Adjudant-Réau highlighted the progress being made in aviation technology and the potential for airships to serve both military and civilian purposes. As the world continued to explore the skies, such records served as benchmarks for future achievements in flight.