The 20 largest airlines in the world

The estimated revenues of the 20 largest airlines in the world, as well as the location of their headquarters and the number of employees, are:

1. American Airlines: 

Approximately $17.3 billion, headquartered in Fort Worth, Texas, USA, approximately 133,700 employees

2. Delta Air Lines:

Approximately $17.1 billion, headquartered in Atlanta, Georgia, USA, approximately 91,000 employees

3. United Airlines: 

Approximately $15.4 billion, headquartered in Chicago, Illinois, USA, approximately 92,000 employees

4. Lufthansa Group: 

Approximately $12.7 billion, headquartered in Cologne, Germany, approximately 110,000 employees

5. Air France-KLM: 

Approximately $12.6 billion, headquartered in Paris, France (Air France) and Amstelveen, Netherlands (KLM), approximately 83,000 employees

6. Southwest Airlines: 

Approximately $9.9 billion, headquartered in Dallas, Texas, USA, approximately 66,100 employees

7. Emirates:

Approximately $8.4 billion, headquartered in Dubai, UAE, approximately 59,000 employees

8. China Southern Airlines:

Approximately $7.8 billion, headquartered in Guangzhou, China, approximately 100,000 employees

9. Ryanair:

Approximately $7.2 billion, headquartered in Swords, Dublin, Ireland, approximately 19,000 employees

10. International Airlines Group (IAG):

Approximately $6.5 billion, headquartered in London, UK, approximately 60,000 employees

11. Turkish Airlines:

Approximately $6.1 billion, headquartered in Istanbul, Turkey, approximately 37,000 employees

12. Qantas Airways:

Approximately $5.5 billion, headquartered in Mascot, New South Wales, Australia, approximately 22,000 employees

13. Singapore Airlines: 

Approximately $4.7 billion, headquartered in Singapore, approximately 26,000 employees

14. Cathay Pacific Airways:

Approximately $4.3 billion, headquartered in Hong Kong, approximately 33,000 employees

15. Air Canada: 

Approximately $4.2 billion, headquartered in Montreal, Quebec, Canada, approximately 30,000 employees

16. EVA Air:

Approximately $3.8 billion, headquartered in Taoyuan, Taiwan, approximately 10,000 employees

17. Etihad Airways:

Approximately $3.8 billion, headquartered in Abu Dhabi, UAE, approximately 13,000 employees

18. ANA Holdings:

Approximately $3.6 billion, headquartered in Tokyo, Japan, approximately 46,000 employees

19. SAS Group: 

Approximately $2.8 billion, headquartered in Stockholm, Sweden, approximately 10,000 employees

20. JetBlue Airways:

Approximately $2.7 billion, headquartered in Long Island City, New York, USA, approximately 22,000 employees

Note: These figures are estimates based on available financial data and may vary from source to source.