(1) American Airlines
American Airlines, Inc. (AA) is a major United States airline headquartered in Fort Worth, Texas, within the Dallas-Fort Worth metroplex. It is the world’s largest airline when measured by fleet size, revenue, scheduled passengers carried, scheduled passenger-kilometers flown, and number of destinations served. American, together with its regional partners, operates an extensive international and domestic network with an average of nearly 6,700 flights per day to nearly 350 destinations in more than 50 countries.
(2) Delta Air Lines
Delta Air Lines, Inc., often referred to simply as Delta, is a major United States airline, with its headquarters and largest hub at Hartsfield–Jackson Atlanta International Airport in Atlanta, Georgia. The airline, along with its subsidiaries and regional affiliates, operates over 5,400 flights daily and serves an extensive domestic and international network that includes 319 destinations in 54 countries on six continents, as of October 2016.
(3) Southwest Airlines
Southwest Airlines Co. is a major United States airline headquartered in Dallas, Texas, and is the world’s largest low-cost carrier. The airline was established in 1967 by Herb Kelleher as Air Southwest Co. and adopted its current name, Southwest Airlines Co., in 1971, when it began operating as an intrastate airline wholly within the state of Texas, first flight between Dallas and San Antonio.
(4) United Airlines
United Airlines, Inc., commonly referred to as United, is a major United States airline headquartered in Chicago, Illinois. It is the world’s third-largest airline when measured by revenue, after American Airlines and Delta Air Lines. United operates a large domestic and international route network, with an extensive presence in the Asia-Pacific region. United is a founding member of the Star Alliance, the world’s largest airline alliance with a total of 28 member airlines. Regional service is operated by independent carriers under the brand name United Express.
Ryanair DAC is an Irish low-cost airline founded in 1984, headquartered in Swords, Dublin, Ireland, with its primary operational bases at Dublin and London Stansted airports. In 2016, Ryanair was the largest European airline by scheduled passengers flown, and carried more international passengers than any other airline.
(6) China Southern Airlines
China Southern Airlines Company Limited is an airline headquartered in Baiyun District, Guangzhou, Guangdong Province, China. Established on 1 July 1988 following the restructuring of the Civil Aviation Administration of China that acquired and merged a number of domestic airlines, the airline became one of China’s “Big Three” airlines (alongside Air China and China Eastern Airlines), the world’s sixth-largest airline measured by passengers carried and Asia’s largest airline in fleet size, revenue and passengers carried. With its main hubs at Guangzhou Baiyun International Airport and Beijing Capital International Airport, the airline operates more than 2,000 flights to 208 destinations daily as a member of SkyTeam.
(7) China Eastern Airlines
China Eastern Airlines Corporation Limited, colloquially known as 东航/東航, is an airline headquartered in the China Eastern Airlines Building, on the grounds of Shanghai Hongqiao International Airport in Changning District, Shanghai. It is a major Chinese airline operating international, domestic and regional routes. Its main hubs are at Shanghai Pudong International Airport and Shanghai Hongqiao International Airport, with secondary hubs at Beijing Capital International Airport, Kunming Changshui International Airport and Xi’an Xianyang International Airport.
EasyJet Airline Company Limited, styled as easyJet, is a British low-cost carrier airline headquartered at London Luton Airport. It operates domestic and international scheduled services on over 820 routes in more than 30 countries. easyJet plc is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. easyGroup Holdings Ltd (the investment vehicle of the airline’s founder Stelios Haji-Ioannou and his family) is the largest shareholder with a 34.62% stake (as of July 2014). It employs nearly 11,000 people, based throughout Europe but mainly in the UK.
(9) Turkish Airlines
Turkish Airlines, Türk Hava Yolları, is the national flag carrier airline of Turkey. As of 2017, it operates scheduled services to 302 destinations in Europe, Asia, Africa, and the Americas, making it the largest carrier in the world by number of destinations (excluding regional brands). It serves more destinations non-stop from a single airport than any other airline in Europe. Turkish Airlines flies to 120 countries, more than any other airline. With an operational fleet of 15 cargo aircraft, the airline’s cargo division serves 73 destinations.
Deutsche Lufthansa AG, dɔʏtʃə ˈlʊfthanza, commonly known as Lufthansa (sometimes also as Lufthansa German Airlines), is the largest German airline and, when combined with its subsidiaries, also the largest airline in Europe both in terms of fleet size and passengers carried during 2017. The name of the company is derived from the German word, Luft ‘air’ and Hansa, the Hanseatic League. Lufthansa is one of the five founding members of Star Alliance, the world’s largest airline alliance, formed in 1997.