Following World War I, a number of adventurous pilots began using airplanes for “utility aviation”—commercial photography, surveying, law enforcement, agricultural purposes such as seeding and crop dusting, and myriad other activities. In the United States, huge numbers of war-surplus engines and training aircraft, as well as larger planes such as the DH-4, offered a cheap and easy way to enter the flying business. Although barnstormers and acrobatic fliers all too often tarnished the image of aviation by performing foolhardy stunts in worn-out military castoffs, the phenomenon of utility aviation attracted increasing numbers of users. By the late 1920s, as the supply of war surplus aircraft and engines dried up, new companies began to offer improved engines and planes, including aircraft with enclosed cabins that could seat two to five people, bringing an end to open cockpits, helmets, goggles, and considerable engine noise.

Throughout the 1930s, despite the Great Depression, improvements continued, and the practice of using personal aircraft to conduct business became a recognized aspect of modern commerce, especially as American industry continued its pattern of geographic diversity and scattered divisions. In order to save time and expensive personnel costs, business aviation provided the means to deliver key people to locations where airlines did not fly and road or rail travel was indirect and time-consuming. Among the most popular private aircraft models were the two-seat Piper Cub, powered by a 65-horsepower engine that enabled a cruising speed of about 85 miles (140 km) per hour; the four-seat Cessna Airmaster, powered by a 145–165-horsepower engine that enabled a cruising speed of about 160 miles (260 km) per hour; and the seven to nine passenger Beechcraft Model 18, powered by two 450-horsepower engines that enabled a cruising speed of about 220 miles (350 km) per hour. Cessna and Beechcraft still used radial-piston engines, but Piper relied on a horizontally opposed four-cylinder engine that allowed engineers to design a more streamlined engine nacelle. This type of engine became the preferred style for modern light-plane designs.

Other developments included Igor Sikorsky’s work on practical piston-engine helicopters. Technological precedents in the 1930s included the autogiro, which used an unpowered rotor for lift and a piston engine with propeller for forward flight, but they could not match the helicopter’s ability for vertical flight and hovering. Postwar efforts to fly helicopters as short-haul passenger transports foundered, although they became invaluable in specialized missions (medevac, police patrol, traffic monitoring) and in sundry utility roles. However, compared with fixed-wing aircraft, their numbers remained small.

After World War II, the accelerating demand for personal and utility aircraft gave rise to the term general aviation to describe all flying that did not fall into the category of military or scheduled air transport. Manufacturers such as Piper, Cessna, and Beechcraft represented an expanding “light plane industry,” although the general aviation sector included a host of modified aircraft that ranged from war surplus twin-engine Douglas A-26 bombers (rebuilt with luxury passenger cabins as fast, corporate transports) to four-engine DC-4 transports (reequipped with big internal fuselage tanks to dump retardants on forest fires). For the light plane builders, engine manufacturers such as Lycoming, Continental, and others perfected efficient horizontally opposed piston engines that produced from 65 to more than 200 horsepower; mass production made them dominant in international applications; several appeared as turbo-supercharged designs delivering more than 300 horsepower.

Various engines powered a bewildering variety of postwar light planes, although Piper, Cessna, and Beechcraft led the market. Through the 1950s, Piper and Cessna marketed high-wing monoplanes with two to four seats, suitable for short-range personal business flying. Beechcraft introduced the stylish all-metal V-tailed Bonanza, with retractable landing gear, higher speed, and a roomy four-place cabin. Manufacturers installed a new generation of compact lightweight radio communication and navigational equipment (eventually dubbed avionics) that improved options to fly during bad weather. Eventually, all three manufacturers produced twin-engine aircraft, aimed at business travel, that could carry four to six people in more comfort at faster speeds. These designs eventually progressed into “cabin-class” corporate transports with supercharged engines, flown by a pilot and copilot, luxury accommodations for four to eight passengers in a pressurized cabin, a lavatory, and a door with a built-in stairway.

Although aircraft produced in the United States dominated the worldwide general aviation fleet, designs from other countries also won a significant market and became essential cogs in the economies of numerous global regions. Canada, with a long history of aircraft used in wilderness flying, produced a rugged example known as the Beaver, built by De Havilland’s Canadian firm. With a big radial engine of 450 horsepower (or more), the high-wing Beaver could carry six to seven people (often more), or about 1,700 pounds (770 kg) of payload (usually more). The Beaver’s moderate size allowed pilots to maneuver the plane in and out of primitive abbreviated airstrips. Fitted with either floats or skis, depending on the locale and season, Beavers could reach virtually any point in Canada’s wilderness of forests, lakes, and Arctic terrain. De Havilland built 1,692 of these remarkably adaptable aircraft, and they served in 63 countries, ranging from tropical climes to polar regions.

The Soviet Union produced an aircraft of similar versatility, the Antonov AN-2. With its 1,000-horsepower radial engine, the AN-2 possessed a capacious barrel-like fuselage that could accommodate a dozen or so passengers or 4,000 pounds (1,800 kg) of cargo. Introduced in 1947, it featured a biplane configuration, and its large wing area gave it excellent flying characteristics for low-level agricultural applications—its principal intended function. But the AN-2’s ability to operate from the isolated and rugged airstrips that dotted the Soviet Union made it a classic all-purpose airplane. In many remote areas such as Siberia, the AN-2 flew Aeroflot’s colours as a local and short-haul passenger transport as well as cargo hauler and air ambulance. With more than 5,000 produced in Ukraine by the late 1950s, followed by approximately 11,900 in Poland during the 1960s, the AN-2 not only served throughout the Soviet bloc but also appeared in Africa, Latin America, and Asia. Within the Soviet bloc, Poland, Romania, and Czechoslovakia built a variety of other general aviation types, including agricultural models.

In Great Britain, Beagle Aircraft Ltd. enjoyed some success in the 1960s. The distinctive name represented an acronym derived from British Executive and General Aviation Limited. Although several dozen airplanes entered service, they could not compete with their well-equipped counterparts from American manufacturers, whose products were backed by efficient international dealer networks. Other companies that produced planes for corporate use and small “feeder” airlines fared better. The twin-engine De Havilland (later, Hawker Siddeley) Dove arrived in 1945 as a low-wing design with retractable gear and a capacity for 11 passengers. It remained in production through the 1960s, with 554 Doves built, including 200 for military operators. The second aircraft was the Britten-Norman Islander, with headquarters located on the Isle of Wight. Designed as an up-to-date replacement for obsolete types such as the Dove, the twin-engine Islander debuted in the mid-1960s. Along with modern avionics, it featured a high wing and fixed gear, and its metal construction followed simple, easily fabricated lines with seats for nine passengers, keeping its cost to about one-third that of the Dove and similar planes. The Islander sold well, although its production sites tended to hopscotch around the world, including fabrication sites in Romania as well as the Philippines. Further modifications to the original design involved a remarkable stretch of the fuselage to accommodate the pilot and one passenger on the flight deck and 16 passengers in the main cabin and a redesigned wing and tail assembly. With its highly distinctive third piston engine mounted atop the vertical tail rudder, it became the Tri-Islander. Still flying in the 21st century, the various Islanders served effectively in many thinly populated areas having geographical constraints, such as the Caribbean, and carried thousands of passengers there and elsewhere around the world.

The French were also busy producing light planes to compete with American products. As in Britain, dozens of types came and went during the postwar decades. Among those with staying power, factory-built aircraft designed for sale in kit form enjoyed lively sales, although many of them remained partially completed and moldering away in basements, garages, and barns. In 1966 an extensive realignment of French manufacturers led to the formation of Société de Construction d’Avions de Tourisme et d’Affaires, or Socata. The new company continued to build the proven Rallye, a trim two-passenger monoplane, but achieved notable success with its own range of larger, more powerful single-engine business planes with retractable gear. By the 1990s, the performance and reliability of the Socata Tobago and Trinidad series had made them serious competitors in the North American market.

Through the 1960s, piston-engine airliners still played a major role in air travel, and their ubiquitous counterparts in general aviation enlivened the aeronautical scene. In 1969 commercial airlines counted about 2,500 transports; 122,500 aircraft represented the general aviation fleet. The subsequent impact of gas-turbine engines transformed both categories. Older piston-engine airliners often soldiered on as firefighting tankers, while many others shuttled passengers and cargo from remote airfields to various destinations. Myriads of piston-powered light planes continue to populate the airways everywhere. The grand epoch of piston-engine aircraft may have waned, but their story continues.