2025 Was The Busiest Year For US Air Travel In More Than 15 Years, FAA Says
2025 marked the busiest year for US air travel in more than 15 years, according to the Federal Aviation Administration (FAA). The country’s civil aviation agency oversaw 17.2 million flights during the year, despite repeated disruptions to the nation’s air traffic control system and the added strain of a 43-day government shutdown, both of which complicated flight operations.
American Airlines was among the busiest carriers operating both in the United States and globally. According to the air travel analytics company OAG, the airline operated 2.3 million flights during the year. Delta Air Lines followed with 1.8 million flights, while United Airlines closely trailed with 1.7 million flights over the same period.
Record Growth In Air Travel Activity
The FAA has recorded a steady rise in flight activity across the country since the COVID-19 pandemic, which had severely impacted the aviation industry. In 2025, activity surpassed pre-pandemic levels, with the system handling roughly 200,000 more flights than in 2019, a year that had previously set record numbers for US air travel.
Naturally, the lowest number of flights handled by the FAA occurred in 2020, with just seven million, ten million fewer than in 2019. Activity began to rebound in 2021, when the FAA recorded 14.4 million flights, followed by 15.8 million in 2022. The upward trend continued with 16.4 million flights in 2023 and 16.9 million in 2024, still slightly below pre-COVID levels. In a social media post, the FAA said:
“2025 was the busiest year for air travel in more than 15 years! The FAA managed 17.2M flights last year. Thanks to our dedicated aviation professionals who put safety first, every flight, every day — helping millions of passengers reach their destinations safely.”
World’s Busiest Airline: American Airlines
American Airlines emerged as the busiest airline not only in the United States but also worldwide. According to OAG, the Dallas/Fort Worth–based carrier led global rankings with 2.3 million flights operated during the year. Four of the top five airlines by flight frequency were US-based, with the exception of the fifth-ranked carrier, Ryanair.
Following American Airlines, 
Delta Air Lines was the second-busiest carrier, operating 1.8 million flights. United Airlines recorded 1.7 million flights, while Southwest Airlines handled 1.4 million. Ryanair, the only non-US airline in the top five, operated 1.1 million flights.
|
Airlines |
Number Of Flights In 2025 |
|---|---|
|
American Airlines |
2.3 million |
|
Delta Air Lines |
1.8 million |
|
United Airlines |
1.7 million |
|
Southwest Airlines |
1.4 million |
|
Ryanair |
1.1 million |
American Airlines also led globally in seat capacity in 2025, offering a total of 279.6 million seats. Delta Air Lines followed with 246.9 million seats, while Southwest Airlines and 
United Airlines operated 229.2 million and 225.5 million seats, respectively, according to OAG. Another key performance metric for airlines is Available Seat Kilometres (ASKs). When ranked by ASKs, United Airlines leads the industry with 536.5 billion, followed by American Airlines with 487.9 billion ASKs.
The World’s Largest Airline By Number Of Flights
American Airlines has the most flights scheduled in 2025.
The Busiest Day In Air Travel Is Friday
The world’s busiest day for air travel in 2025 occurred on August 1 (Friday), during the peak summer season. According to OAG, global airline seat capacity reached 19,833,642, making it the busiest day of the year and surpassing 2024’s peak day by more than 555,000 seats.
Interestingly, since 2009, each of the busiest days for air travel has fallen on a Friday. As expected, the peak day for global airline capacity typically occurs in July or August, aligning with the height of the summer travel season.
The only exceptions occurred in 2020 and 2021, when the global pandemic triggered widespread travel restrictions and sharply reduced flight capacity. In 2020, capacity peaked on January 3, the last Friday before news of the COVID-19 virus began spreading worldwide. The lowest daily global airline capacity recorded in 2025 was on January 28 (Tuesday), with 15,200,778 seats scheduled.
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