In addition to the article posted on August 5th 2019, and concerning IATA statistics published recently, the most important airlines in terms of total passenger-kilometres on scheduled flights are:
1. American Airlines (330.6 billion)
2. Delta Air Lines (330 billion)
3. United Airlines ($329.6 billion)
4. Emirates (302.3 billion)
5. Southwest Airlines ($214.6 billion)
It can be seen here that when we evaluate the airlines under these data, the three most important ones are American and prove a significant volume of transport by the United States.
As a reminder, the “passenger-kilometre” or “passenger-kilometre” is a unit of measurement of the quantity of transport corresponding to the transport of a person over one kilometre.