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Aviation includes the activities surrounding mechanical flight and the aircraft industry. Aircraft include fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air aircraft such as hot air balloons and airships.
Aviation began in the 18th century with the development of the hot air balloon, an apparatus capable of atmospheric displacement through buoyancy. Clément Ader built the "Ader Éole" in France and made an uncontrolled, powered hop in 1890. This was the first powered aircraft, although it did not achieve controlled flight. Some of the most significant advancements in aviation technology came with the controlled gliding flying of Otto Lilienthal in 1896. A major leap followed with the construction of the Wright Flyer, the first powered airplane by the Wright brothers in the early 1900s.
Since that time, aviation has been technologically revolutionized by the introduction of the jet engine which enabled aviation to become a major form of transport throughout the world. In 2024, there were 9.5 billion passengers worldwide according to the ICAO. As of 2018, estimates suggest that 11% of the world's population traveled by air, with up to 4% taking international flights. (Full article...)
External aerodynamics is the study of flow around solid objects of various shapes. Evaluating the lift and drag on an airplane, the shock waves that form in front of the nose of a rocket is an example of external aerodynamics. Internal aerodynamics is the study of flow through passages in solid objects. For instance, internal aerodynamics encompasses the study of the airflow through a jet engine.
The ratio of the problem's characteristic flow speed to the speed of sound comprises a second classification of aerodynamic problems. A problem is called subsonic if all the speeds in the problem are less than the speed of sound, transonic if speeds both below and above the speed of sound are present (normally when the characteristic speed is approximately the speed of sound), supersonic when the characteristic flow speed is greater than the speed of sound, and hypersonic when the flow speed is much greater than the speed of sound. Aerodynamicists disagree over the precise definition of hypersonic flow; minimum Mach numbers for hypersonic flow range from 3 to 12. Most aerodynamicists use numbers between 5 and 8. (Full article...)

... that Paul Haenlein was the first to create a dirigible airship powered by an internal combustion engine? ...that No. 112 Squadron RAF was the first unit from any air force to use the "Shark Mouth" logo on P-40 fighter planes? ... that Walter Borchers was one of three brothers, all three received the Knight's Cross of the Iron Cross during World War II?
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His career began in World War II as a private in the U.S. Army Air Forces. After serving as an aircraft mechanic, in September 1942 he entered enlisted pilot training and upon graduation was promoted to the rank of Flight Officer (WW 2 U.S. Army Air Forces rank equivalent to Warrant Officer) and became a P-51 Mustang fighter pilot. After the war he became a test pilot of many kinds of aircraft and rocket planes. Yeager was the first man to break the sound barrier on October 14, 1947, flying the experimental Bell X-1 at Mach 1 at an altitude of 45,000 ft (13,700 m). Although Scott Crossfield was the first man to fly faster than Mach 2 in 1953, Yeager shortly thereafter exceeded Mach 2.4. He later commanded fighter squadrons and wings in Germany and in Southeast Asia during the Vietnam War, and in recognition of the outstanding performance ratings of those units he then was promoted to Brigadier-General. Yeager's flying career spans more than sixty years and has taken him to every corner of the globe, even into the Soviet Union during the height of the Cold War.

The Pregnant Guppy was a large, wide-bodied cargo aircraft built in the USA and used for ferrying outsized cargo items, most notably NASA's components of the Apollo moon program. The Pregnant Guppy was the first of the Guppy line of aircraft produced by Aero Spacelines, Inc. The design also inspired similar designs such as the jet-powered Airbus Beluga, and the Boeing 747 LCF designed to deliver Boeing 787 parts.