1、 The busiest airlines in the world are:

 

The North Atlantic air line between Western Europe and North America. The route is mainly connected with air hubs such as Paris, London, Frankfurt, New York, Chicago and Montreal.

 

Western Europe Middle East Far East air line. This route connects major airports in Western Europe to Hong Kong, Beijing, Tokyo and other airports in the Far East. It also passes through Athens, Cairo, Karachi, New Delhi, Bangkok, Singapore and other important air terminals.

 

The North Pacific route between the Far East and North America. This is the air line from Beijing, Hong Kong, Tokyo and other airports to Vancouver, Seattle, San Francisco, Los Angeles and other airports on the west coast of North America via the North Pacific. It can also extend to the airport on the east coast of North America. Honolulu in the middle of the Pacific Ocean is the main relay gas station of the route.

 

2、 In addition, there are also important international air routes such as North America - South America, Western Europe - South America, Western Europe - Africa, Western Europe - Southeast Asia - Australia and New Zealand, the Far East - Australia and New Zealand, and North America - Australia and New Zealand