||The examples and perspective in this article may not represent a worldwide view of the subject. (January 2015)|
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
|Airline||Regional subsidiaries1||Regional brand2|
|American Airlines3||Envoy Air||American Eagle|
|US Airways3||PSA Airlines
|US Airways Express|
|Delta Air Lines||Endeavor Air||Delta Connection|
|United Airlines||No regional subsidiary||United Express|
|Alaska Airlines||Horizon Air||Alaska Horizon
|Hawaiian Airlines||No regional subsidiary||Ohana by Hawaiian|
|Allegiant Airlines||No regional subsidiary||No regional brand|
|Frontier Airlines||No regional subsidiary||Great Lakes Aviation4|
|JetBlue Airways||No regional subsidiary||Cape Air4|
|Southwest Airlines||No regional subsidiary||No regional brand|
|Spirit Airlines||No regional subsidiary||No regional brand|
|Sun Country Airlines||No regional subsidiary||No regional brand|
|Virgin America||No regional subsidiary||No regional brand|
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.
3Owned by American Airlines Group; full integration under the American Airlines name pending.
4 These independent airlines operate regional aircraft under codeshare agreements with a mainline carrier.
||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (April 2009)|
- , AA and early references to mainline, regional and B-scale