With the hustle and bustle of parking, security lines, departures, and arrivals, every traveler knows that airports are usually busy places. Especially true for large or international airports, the mix of passengers from different countries and cultures combined with the stress of trying to check bags, print boarding passes, and get to your gate on time creates an atmosphere of excitement and anticipation. You'll find all these things and more at the busiest airports in the United States.

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01O'Hare International Airport, Chicago

When it comes to being named the busiest airport in the U.S., it turns out there is fierce competition for the top spot. Airports are evaluated based on the number of "flight operations," which can include commercial airline flights, general aviation flights, military flights, and air taxi operations. However, another measure to determine business is the total number of passengers served by the airport. The most recent data from the FAA shows that O'Hare International Airport in Chicago was the U.S. airport with the greatest number of flight operations in 2018 with over 903,000 arrivals and departures. United Airlines, O'Hare's largest carrier, added many flights from the Chicago hub to other domestic destinations, helping to put O'Hare on top.

The colored electric neon tunnel The Sky Is the Limit at Chicago O'Hare International Airport