The initial role of aircraft in World War I was predominantly reconnaissance—gathering intelligence and offering aerial views of enemy positions. Soon, the necessity to counter hostile aerial reconnaissance led to the development of air-to-air combat techniques, giving birth to the dogfight (close-range aerial battle).

Legendary aviators, or aces, emerged during this period, with figures such as Manfred von Richthofen, known famously as the Red Baron, shaping aerial tactics that still inform modern air combat principles. As warfare moved toward aerial duels, aircraft design rapidly improved to meet combat demands.

Between World War I and World War II, global military aviation underwent massive transformation. Major technical innovations included the advent of metal airframes, improved aerodynamics, retractable landing gear, and advancements in engine reliability and power. These innovations paved the way for the sophisticated aircraft of future conflicts.

Notably, aircraft like the German Messerschmitt Bf 109 and Britain's Supermarine Spitfire demonstrated how engineering ingenuity was rapidly converting aerial machinery into indispensable national defense tools.

World War II represented the apex of military aviation development during the 20th century. Bombers, fighters, and transports played key roles on all fronts, reshaping entire campaigns. Strategic bombing missions and aerial dogfights portrayed aviation's indispensable role vividly and forever changed the scope of world conflicts.

Technological leaps such as jet propulsion, radar-guided navigation, and improved weaponry significantly altered airborne engagements. Aircraft including the North American P-51 Mustang, Boeing B-17 Flying Fortress, and the Messerschmitt Me 262 jet fighter exemplified WWII's record-breaking technological strides.