Ranked: The World’s Busiest Airlines by Flights in 2024

Fresh schedule analysis for 2024 highlights how a handful of mega-carriers now shoulder a growing share of the world’s air traffic, with U.S. and Chinese airlines leading the pack in total operated flights.

American Airlines Holds the Global Top Spot

American Airlines emerges as the world’s busiest carrier by scheduled flights in 2024, according to industry schedule data compiled by analytics firm OAG. The figures, drawn from billions of available seats and flights worldwide, place American ahead of both its U.S. rivals and major international competitors in terms of total departures.

OAG data for 2024 indicates that American is scheduled to operate more than 275 million seats across its network this year, up from around 259 million in 2023. That capacity is underpinned by a dense domestic network in the United States, a strong presence in transcontinental markets and expanding long haul services to Europe and Latin America, making the carrier a central pillar of global air connectivity.

The continued growth at American reflects both the strength of the U.S. market and a strategic focus on high-frequency routes built around its hubs in Dallas Fort Worth, Charlotte and other large connecting airports. The carrier’s position at the top of the ranking underscores how North American airlines have used scale and network depth to consolidate their role in the post-pandemic recovery.

Delta, Southwest and United Anchor a U.S.-Heavy Top Five

Behind American, Delta Air Lines, Southwest Airlines and United Airlines all feature prominently among the world’s busiest airlines by flights, further reinforcing the dominance of U.S.-based groups. OAG’s 2024 schedule tables show Delta and Southwest each scheduled to operate well over 230 million seats this year, while United surpasses 212 million.

Southwest, while operating almost exclusively within North America, remains one of the largest carriers globally by number of flights thanks to its point-to-point, high-frequency model. Even as the airline trims some capacity compared with 2023, it still ranks among the world leaders in daily departures across the United States and to near-international leisure destinations.

Delta and United combine vast domestic operations with extensive international networks, particularly over the Atlantic and to key hubs in Asia and Latin America. Publicly available data from Cirium shows both carriers operating more than 1.6 million flights annually, underlining the scale that supports their inclusion near the top of any ranking based on flights operated.

Ryanair and IndiGo Push Low-Cost Growth

Europe’s Ryanair and India’s IndiGo are notable standouts among low-cost airlines climbing the global ranking of busiest carriers. OAG’s 2024 figures show Ryanair scheduled to operate more than 209 million seats, a jump of over 9 percent year on year, placing it just behind the largest U.S. airlines in total capacity.

Ryanair’s model of dense, short haul flying across Europe translates into very high aircraft utilisation and flight counts, even if individual sectors are relatively short. The airline’s strategy of rapidly adding routes from secondary and regional airports allows it to boost frequencies and departures without relying solely on the continent’s largest hubs.

In India, IndiGo has become one of the world’s busiest airlines by flights by focusing on domestic connectivity and selective regional international routes. OAG data indicates IndiGo’s scheduled capacity exceeds 134 million seats in 2024, growing more than 10 percent in a single year. With a large narrowbody fleet and aggressive expansion into tier-two and tier-three Indian cities, the carrier’s high-frequency operations are reshaping traffic flows across the subcontinent.

China’s Big Three Return to the Top Tier

China Southern Airlines, China Eastern Airlines and Air China, often referred to as China’s big three, are firmly back in the global top tier of busiest airlines by flights as international travel from China continues to recover. OAG’s 2024 schedules show each of these carriers operating tens of millions of seats, with China Southern alone surpassing 148 million.

During the height of the pandemic, strict travel restrictions forced sharp capacity cuts across Chinese networks. The latest schedule data reflects a different picture, with domestic routes again heavily utilized and international links gradually restored across Asia Pacific, Europe and North America. Growth of between 2 and 8 percent in scheduled capacity for the big three between 2023 and 2024 highlights a steady rebound.

The scale of China’s domestic market means that many of these flights are relatively short sectors between major population centers, but their frequency generates some of the highest departure counts of any airlines worldwide. As more widebody aircraft return to long haul duty, the share of international flights in the mix is likely to keep rising.

Global Recovery Drives Higher Flight Counts

Beyond individual airlines, industry data from Cirium shows that global passenger traffic in 2023 finished only a few percentage points below the pre-pandemic peak of 2019, and early 2024 schedules point to further modest growth. That recovery is visible in the flight totals reported by the world’s busiest carriers, many of which are operating more services than they did in the immediate post-crisis years.

While the overall list of busiest airlines by flights is led by large U.S., European and Chinese operators, the rankings also highlight the momentum of carriers from fast-growing markets such as India and Latin America. Airlines including LATAM and Qatar Airways, which both show strong year-on-year capacity increases in OAG’s 2024 data, are steadily expanding their share of global traffic.

Analysts note that capacity growth is now more measured than the rapid rebound of 2022 and early 2023, as carriers weigh operational resilience, staffing constraints and aircraft delivery delays. Even so, the concentration of flights among a relatively small number of mega-carriers suggests that travelers worldwide will continue to rely on these networks for the majority of their journeys in the coming year.