Regional airliner

A regional airliner or a feederliner is a small airliner that is designed to fly up to 100 passengers on short-haul flights, usually feeding larger carriers' airline hubs from small markets. This class of airliners are typically flown by the regional airlines that are either contracted by or subsidiaries of the larger airlines. Regional airliners are used for short trips between smaller towns or from a larger city to a smaller city. Feederliner, commuter, and local service are all alternative terms for the same class of flight operations.

In the early days of aviation, most aircraft had a relatively short range so that all airlines were "regional" in nature. With the introduction of longer range aircraft, notably flying boats, these shorter range planes increasingly found their niche feeding the newer and longer range airliners by flying passengers to the mainline's airline hubs. Many of these smaller regional airlines were eventually bought by the larger flag carriers.

To keep these short routes economical, the airlines were generally unwilling to spend large amounts of money on new aircraft; at times they used second hand aircraft. Also, as new models slowly emerged, older aircraft were put into this service when they were replaced by progressively longer-range designs. In the immediate post-war era these were typically Douglas DC-3s, although even the De Havilland Dragon Rapide biplane airliner remained in service for some time. This "hand-me-down" process of supplying aircraft continued with designs like the Convair 440, Douglas DC-6 and Vickers Viscount also serving in this role while the first jets were introduced.

By the mid-1950s, demand for even more economical designs led to the production of the first custom feederliners. These were almost always turboprops, which had fuel economy on par with piston engine designs, but had far lower maintenance costs. Often the time between engine overhaul periods was five times that of the best piston engines. Early examples of these designs include the Fokker F27 Friendship, Avro 748, and Handley Page Dart Herald.

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