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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 US Airways but it would not include 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. Often US mainline airline carriers operate in-house brands such as United p.s. to cater to business segments such as the short-range air shuttle, low-cost, or premium-service flights which normally would not support the traffic or revenue yield needed for the traditional operation of larger mainline aircraft with over 100 passenger seats between selected city pairs. ==Major U.S. Mainline Carriers== Notes: 1 Wholly owned subsidiaries with separate operating certificates flying regional jets under the regional branding. 2 Branding used for regional feeder service and commuter flights. Operated either by a regional subsidiary or under contract by an independent regional airline. 3 These independent airlines operate regional aircraft under codeshare agreements with a mainline carrier. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mainline (aeronautics)」の詳細全文を読む スポンサード リンク
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