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The US market is one of the most (if not the most) diverse and influential segments of the global commercial aviation market. Major US airlines, such as 
United Airlines, 
Delta Air Lines, 
American Airlines, and 
Southwest Airlines are all consistently positioned well near the top of the world’s largest airlines list. A big factor in this is the scale of the domestic US market, which is incredibly mature and expansive.With so many large airlines operating in one country, the US is home to some of the world’s busiest airports. Then, considering the international travel market into and out of the US, airports like 
New York JFK Airport and 
Los Angeles International Airport have become true nexuses of global air travel. However, neither of these airports is the busiest in the US, which may be surprising given the global influence of each city. This article will profile the busiest airport in the US and highlight how the answer is not as straightforward as it may seem for some.
How Do You Define “Busiest”?
The title of busiest airport can mean a few different things. For one, it means the total number of passengers who travel through an airport, or the foot traffic. On the other hand, busiest can be defined as the total number of departing and arriving flights at an airport. Both statistics offer a meaningful snapshot of an airport’s operations, but traditionally, foot traffic, or volume, is the metric of comparison for global airports. This figure includes passengers in transit as well, who are only connecting through the airport to a different final destination.
It is an increasingly loud debate. Airports across the US all compete for the title of the busiest, which is then often spun to mean the best or most capable. For a city to have a busy airport is a huge plus. It boosts the economy in many ways and elevates the city on a national level. But the claim to be the busiest airport in the US is a contested one.
Chicago’s Claim
Recently, Chicago has staked its claim as having the country’s busiest airport, challenging Atlanta and its tenured time at the top. In particular, 
Chicago O’Hare International Airport has seen massive growth over the last few years and has been the battlefield for intense competition between United and American in recent months. Both airlines have major hubs at ORD, and the rivalry has heated up, with United executives not shying away from calling out their competition.
There is no doubt that Chicago is a central hub of commercial air travel. Newly released FAA total flight data shows that Chicago O’Hare did, in fact, have more total flights take off or land in 2025 than Atlanta, which had held that top spot since 2020. Mayor of Chicago, Brandon Johnson, stated that, “this is more than a statistic, it’s a statement about Chicago’s momentum,” and he is not wrong. The new number represents a 10.5% increase from 2024.
|
Total Flights in 2025 (Arrivals and Departures) |
|
|---|---|
|
Airport |
Total |
|
Chicago O’Hare |
857,392 |
|
Atlanta Hartsfield |
807,625 |
It is important to note that, while making for a good Midwest headline, these numbers are just one way of measuring how busy an airport is. Atlanta representatives responded to Chicago’s claim, citing their own statistics, which paint a strong argument for Atlanta. What is certain is that Chicago is growing, and fast. In fact, its claim will be challenged in 2026, not by another airport, but by the FAA. Due to the intense back and forth between United and American, the FAA is going to mandate a 10% reduction in flights at O’Hare this summer, in an attempt to alleviate congestion. This will stunt the growth O’Hare experienced, but the airport remains one of the central points in the US commercial aviation market.
The World’s Largest Airline By Fleet Size
A battle of the giants.
Atlanta Reigns Supreme
At the end of the day, the most widely acknowledged metric to measure the busyness of an airport is foot traffic, or total passenger volume. The top spot in the US for this number remains with 
Hartsfield-Jackson Atlanta International Airport, as it has been for many years now. Chicago may lead the way in total flights, but Atlanta still has a comfortable lead over O’Hare in the number of passengers that transit through the airport. Specifically, in October 2025, the Bureau of Transportation reported that almost 25 million more passengers traveled through ATL than ORD. Over the entire year, Atlanta saw 106.3 million passengers in 2025.
|
Total Passengers October 2025 |
|
|---|---|
|
Airport |
Total (millions) |
|
Chicago O’Hare |
66.8 |
|
Atlanta Hartsfield |
89.5 |
When comparing the city of Chicago to Atlanta, it may seem odd that so many more people travel through Atlanta than Chicago, given the history and size of each city. However, the keyword is through Atlanta. Hartsfield-Jackson Airport is the gateway to the entire South East of the US. A significant proportion of the people traveling to or from the airport are connected through Atlanta and go on to final destinations in neighboring states. Cities like Birmingham, Shreveport, Savannah, and other cities across the South East that lack a large commercial airline presence are able to have global connectivity via Atlanta Hartsfield.
Delta: Atlanta’s Hometown Airline
It is impossible to talk about Atlanta without mentioning Delta Air Lines. Founded in Georgia in 1925, Delta is about as intertwined with Atlanta as any airline-city pair can be. The company’s global headquarters sits right on the north side of the airport and boasts an expansive flight museum that celebrates the rich, storied history of Delta and its role in commercial aviation. Today, Delta has hubs all across the country, spanning from coast to coast.
In 2025, Delta was responsible for 75% of all passenger volume at Atlanta Hartsfield, and also held the largest share of freight tonnage. Delta places a lot of emphasis on optimizing flights for freight when possible, which is evident in these numbers. This is not to say that Delta is the only airline operating out of KATL, but the airline is an immensely important player in the dynamics of the airport. Even for those flying in on a different airline, it is hard to miss the large “Fly Delta Jets” sign that adorns the Delta Tech Ops hangar on the east side of the airport.
As mentioned, a lot of this volume is from connecting passengers. In fact, Atlanta is not really the main international jumping-off point for Delta. Other hubs on the East Coast, like JFK and Boston, offer more international flights. The heart of Delta’s operations in Atlanta is connecting the South to the rest of the country, a feat that no other airport in the country does as well as Delta out of Atlanta.
Delta Air Lines Hubs: The Top 5 Busiest Gateways In 2026
The airline’s busiest hub in Q1 2026 is Hartsfield-Jackson Atlanta International Airport.
The Strength Of The US Domestic Market
The rivalry between Chicago O’Hare and Atlanta Hartsfield-Jackson underscores the scale of the US aviation market, and in particular, the strength of the domestic market. Both airports serve as a crucial hub that connects passengers to many other smaller destinations in their respective regions. The United States has by far the largest domestic aviation network in the world, supported by its geographic size, large population, and a dispersed system of economic centers. Unlike many countries where international routes dominate, the majority of US air traffic takes place within the country itself.
In turn, this domestic demand supports a dense network of routes linking hundreds of cities and feeding major airline hubs. Large airports such as Dallas/Fort Worth, Denver, Los Angeles, and Charlotte all rank among the world’s busiest airports largely because of domestic traffic. Airlines thus operate high-frequency schedules between major metro areas while also connecting smaller regional markets to national hubs, creating a system that moves hundreds of millions of passengers each year.
Strong leisure travel, a large internal tourism market, and extensive business travel between major economic regions help sustain passenger volumes even when international demand fluctuates. As a result, domestic flying continues to anchor the performance of many of the country’s busiest airports and helps explain why the United States consistently dominates global airport traffic rankings.
Looking Towards The Future
Shutterstock | Simple Flying
One word stands out when thinking about these two airports: momentum. Chicago O’Hare is in the midst of a considerable surge in traffic and is planning to open a new Concourse D in 2028 with 19 new gates. The United-American rivalry is also a testament to the growing importance of ORD as a gateway to the rest of the country and the world.
On the other hand, while Atlanta still reigns supreme in passenger volume statistics, the 2025 numbers are down almost 2% year-over-year from 2024. This is not something to be completely concerned about for Atlanta representatives, but it may signal an impending shift in the airport’s tenure at the top. What is known for sure, however, is that the US aviation market is booming, and airports such as ORD and ATL are essential pieces to that puzzle.
