|Company||Market Cap (USD)|
|Delta Air Lines, Inc.||$31.27 B|
|Southwest Airlines Co.||$23.78 B|
|United Airlines Holdings, Inc.||$18.27 B|
|Ryanair Holdings plc||$18.18 B|
|Air China Ltd||$17.53 B|
The market capitalization of a company, more simply referred to as "market cap", is the total market value of a publicly traded company's outstanding shares. It is often considered as a key indicator of what a company is worth.