Airline passengers - Country rankings:
The average for 2017 was 26.18 million passengers.The highest value was in the USA: 849.4 million passengers and the lowest value was in Monaco: 0 million passengers. Below is a chart for all countries where data are available for: Airline passengers.
Airline passengers of domestically owned airlines, 2017
(million passengers, Source: The International Civil Aviation Organization, TheGlobalEconomy.com)