Aviation in France The national carrier of France is Air France, a full service global airline which flies to 20 domestic destinations and 150 international destinations in 83 countries (including Overseas departments and territories of France) across all 6 major continents. The history of French aviation began at the beginning of the 20th century. The French had been involved in human flight since 1783, when François Rozier and the Marquis d'Arlandes flew over Paris in the first human flight in a Hot air balloon. On 7 January 1785 Jean-Pierre Blanchard crossed the English Channel, from Dover to Calais, on board a hydrogen balloon.
Tradeoffs for locomotion in air and water balloons. By changing the amount of gas in these swim bladders, fish actively control their density. If they increase the amount of air in their swim bladder, their overall density will become less than the surrounding water, and increased upward buoyancy pressures will cause the fish to rise until they reach a depth at which they are again at equilibrium with the surrounding water. In this way, fish behave essentially as a hot air balloon does in air. Some seabird species utilize surface feeding or plunge diving during foraging in which gravity and/or momentum is used to counteract buoyancy effects