Busiest U.S. Airports by Commercial Aircraft Enplanements
Measuring the scale of aviation infrastructure requires more than just counting planes; it requires tracking the movement of people. The Federal Aviation Administration (FAA) monitors enplanements—the number of passengers boarding a commercial aircraft—to determine how airports are categorized and how funding is allocated through the Airport Improvement Program (AIP).
By analyzing enplanement data over a half-calendar year, the FAA identifies "hubs." While airlines may have their own definitions of a hub based on routing and operations, the FAA uses a strict percentage-based system to classify commercial service airports by their volume of traffic.
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How the FAA Classifies Airport Hubs
The FAA divides busy airports into two primary categories based on their share of total U.S. passenger enplanements:
- Large Hubs: Airports that individually account for at least 1 percent of all total U.S. passenger enplanements.
- Medium Hubs: Airports that account for between 0.25 percent and 1 percent of total U.S. passenger enplanements.
Key Facts
- Hartsfield–Jackson Atlanta International Airport (ATL) remains the busiest airport in the U.S., recording 51,459,786 enplanements in 2025.
- The top four airports—Atlanta, Dallas/Fort Worth, O'Hare, and Denver—all exceeded 39 million enplanements in 2025.
- Dallas/Fort Worth (DFW) and O'Hare (ORD) maintain a close competition for the second and third spots.
- The 2020 data shows a significant dip across all hubs, reflecting the global impact on travel during that period.
- There are 30 airports classified as Large Hubs and 35 listed as Medium Hubs in this dataset.
Analysis of Large Hub Performance
Large hubs serve as the primary gateways for the United States. Hartsfield–Jackson Atlanta International Airport continues to lead the nation, though it has seen slight fluctuations from its 2019 peak of 53.5 million. Other major players like Dallas/Fort Worth and Chicago O'Hare consistently handle massive volumes, often exceeding 40 million passengers annually.
Coastal hubs such as Los Angeles (LAX) and John F. Kennedy (JFK) also maintain high rankings, though they experienced more volatile swings in traffic between 2020 and 2025 compared to some inland hubs like Denver (DEN).
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Top 10 Busiest U.S. Airports (2025)
| Rank | Airport | IATA Code | State | 2025 Enplanements |
|---|---|---|---|---|
| 1 | Hartsfield–Jackson Atlanta | ATL | GA | 51,459,786 |
| 2 | Dallas/Fort Worth | DFW | TX | 41,297,009 |
| 3 | O'Hare International | ORD | IL | 40,680,735 |
| 4 | Denver International | DEN | CO | 39,976,695 |
| 5 | Los Angeles International | LAX | CA | 36,497,303 |
| 6 | John F. Kennedy International | JFK | NY | 30,792,806 |
| 7 | Orlando International | MCO | FL | 27,999,709 |
| 8 | Harry Reid International | LAS | NV | 26,531,765 |
| 9 | Miami International | MIA | FL | 26,450,972 |
| 10 | San Francisco International | SFO | CA | 26,251,850 |
Medium Hubs and Regional Growth
Medium hubs provide critical connectivity for mid-sized cities and regional centers. Airports like Midway International (MDW) and Portland International (PDX) lead this category. While their volumes are lower than large hubs, they often show steady growth and serve as essential links for business and tourism.
Interestingly, some medium hubs like Raleigh–Durham (RDU) and Nashville (BNA)—which is a large hub—show the impact of rapid regional urban growth, with enplanements steadily climbing over the last decade.
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Frequently Asked Questions
What is an enplanement?
An enplanement occurs when a passenger boards a commercial aircraft. The FAA uses this metric to measure airport activity and determine funding entitlements.
How does the FAA define a "Large Hub" airport?
A Large Hub is any commercial service airport that accounts for at least 1 percent of the total passenger enplanements in the United States.
Which airport is currently the busiest in the U.S.?
Hartsfield–Jackson Atlanta International Airport (ATL) is the busiest, with over 51 million enplanements in 2025.
What is the difference between an FAA hub and an airline hub?
An FAA hub is a classification based strictly on passenger volume percentages. An airline hub is a strategic operational center used by a specific airline to coordinate flights and connections.
How is a "Medium Hub" defined?
A Medium Hub is an airport that accounts for between 0.25 percent and 1 percent of the total U.S. passenger enplanements.