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Mainline (flight)


A mainline flight is a flight operated by an airline's main operating unit, rather than by regional alliances, regional code-shares or regional subsidiaries.

In the United States, examples of mainline passenger airline flights include those operated by American Airlines, Delta Air Lines, United Airlines, and now defunct US Airways; but not flights operated by regional airlines Envoy Air, Executive Airlines, Piedmont Airlines, or PSA Airlines with regional jets or the services of regional airline marketing brands such as American Eagle, Delta Connection, United Express, or US Airways Express aboard lower-capacity narrowbody jets and turboprop aircraft, such as those produced by Embraer or Bombardier, that do not have transcontinental range.

U.S. legacy carriers may operate branded mainline services using the same flight crews and AOC as that of their mainline operations. For example, United p.s. and American Flagship Service cater to the medium-haul transcontinental business segment. Short-haul air shuttles, such as Delta Shuttle, operate at high frequency intervals between busy city pairs. Previously, U.S. legacy carriers operated low-cost air services within their mainline operations to compete with low-cost carriers; these operations were short-lived and included brands such as Continental Lite, Song (Delta), and Ted (United).


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