There is no “official” ranking of airports, as different organizations use different criteria to rate them. However, Miami International Airport is generally considered to be one of the busiest airports in the world. In 2018, it handled over 44 million passengers and 2 million tons of cargo. It is also the largest gateway between the United States and Latin America and is a major hub for American Airlines. So while there is no “official” ranking, Miami International Airport is certainly one of the most important airports in the world.