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Take the case of PSA Airlines, whose name links to its past, short-lived operations in the Pacific Southwest. The regional carrier, now a US Airways Group subsidiary and part of the US Airways Express network, serves about 65 eastern locations such as Charlotte, North Carolina; Dayton, Ohio; and Knoxville, Tennessee. It connects smaller markets with US Airways hubs like Charlotte and Philadelphia. PSA maintains a fleet of about 50 Canadair regional jets (CRGs) made by Bombardier. Overall, the US Airways Express carriers, including fellow subsidiary Piedmont Airlines and several independent lines, operate about 330 aircraft, comprising turboprops as well as CRGs.

Government-owned airline Garuda Indonesia flies passengers and cargo to more than 40 destinations, split evenly between domestic and international markets (primarily in the Asia/Pacific region). The carrier operates a fleet of about 50 aircraft, consisting mainly of Boeing models. Its low-fare CitiLink affiliate serves about half a dozen Indonesian locations. Garuda extends its international network via code-sharing relationships with several carriers. (Code-sharing allows airlines to sell tickets on one another's flights and thus offer passengers service to additional destinations.) Subsidiaries provide aircraft maintenance and ground-handling services.

Qantas Airways, Australia's #1 airline, flies to about 60 destinations at home and another 85-plus (including some served by code-sharing partners) in about 35 countries. (Code-sharing enables carriers to sell tickets on one another's flights and thus extend their networks.) Its airline operations include regional carrier QantasLink, as well as low-fare carrier Jetstar, both of which operate in Australia and elsewhere in the Asia/Pacific region. Overall, the Qantas fleet includes about 230 aircraft. Qantas is part of the Oneworld global airline alliance, which is led by British Airways (BA) and American Airlines. In late 2008 Qantas and BA began merger talks, but an agreement could not be reached.

A pioneering European discount airline, Ryanair Holdings offers low-fare, no-frills air transportation via its main subsidiary, Ryanair. The carrier flies to about 150 destinations, including more than two dozen in Ireland and the UK; overall, it serves more than 25 countries throughout Europe, plus Morocco. Ryanair specializes in short-haul routes between secondary and regional airports. It operates from more than 35 bases, including airports in Belgium, France, Germany, Italy, Spain, and Sweden, as well as in Ireland and the UK. The carrier maintains a fleet of about 200 Boeing 737-800s. Throughout 2008 and early 2009, Ryanair launched several unsuccessful bids to acquire rival Irish airline Aer Lingus.

Airline group SAS carries passengers throughout Scandinavia -- and well beyond. Most of the company's sales come from its Scandinavian Airlines operations, which include units that operate in Denmark, Norway, and Sweden, as well as Scandinavian Airlines International, which serves destinations in Europe, North America, and Asia. SAS extends its reach as a member of the global Star Alliance, a marketing and code-sharing partnership led by Lufthansa and United Airlines. (Code-sharing allows carriers to sell tickets on one another's flights and thus offer potential passengers more destinations.) Other sources of revenue include airline support businesses and stakes in other airlines.

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