Two months later, on November 21, 1783, Jean-François Pilatre de Rozier and Marquis d’Alandres became the first humans to ascend and pilot a balloon. They flew for 25 minutes and landed safely five miles from their starting point. The Montgolfier-built balloon used heat to create lift. A fire built in the carriage burned straw. The hot air, less dense than the atmosphere, would rise, fill the balloon, and send it skyward. When aloft, aeronauts fed straw into the fire to gain lift and then reduced the flames to descend.