New data released by OAG, a leading global travel data provider, reveals that American Airlines continues to hold its position as the world’s largest airline by frequencies in June 2025. The report highlights significant global capacity growth and shifts within key domestic and regional markets.
American Airlines leads the industry with an impressive 197,700 frequencies this month, a substantial 39,400 more than Delta Air Lines, which ranks second globally by this metric. United Airlines demonstrates the strongest year-on-year growth in flying, adding 11,900 frequencies, closely followed by American Airlines with an increase of 10,000. India’s IndiGo continues its rapid expansion, showing the fastest rate of growth among major carriers, up 9.3% compared to last year.
However, not all top airlines experienced growth. Four carriers within the Top 20 saw a decline in frequencies this month compared to June 2024: Southwest Airlines (-1.3%), Aeroflot (-1.8%), JetBlue (-3.8%), and Lufthansa (-4.7%).
Domestically, the USA remains the dominant market, boasting 92.7 million seats in June 2025, which is over 23.7 million seats larger than the second-largest domestic market, China, with 68.9 million seats. Brazil continues its impressive growth trajectory, leading the Top 10 domestic markets with a 9.7% increase year-on-year, followed by India at 7.4%. Conversely, Indonesia shows the largest rate of decline, down 6.3%, continuing a three-month trend, with Japan also experiencing a slight decline of 0.9%.
Globally, June 2025 capacity is set to reach 523.7 million seats, marking a 3% increase (an additional 17.2 million seats) compared to June 2024. Western Europe now stands as the largest region with 117.7 million seats, narrowly surpassing North America, which has 117.1 million seats, indicating a switch in positions from the previous month.
North East Asia maintains its position as the region with the largest growth in seat capacity, adding 3.7 million seats to reach a total of 109.5 million this month. Central Asia and Lower South America exhibit the highest growth rates, with capacity up 18% and 9% respectively. Central/Western Africa is the only region to show a decline in capacity, down 3% versus last year, a trend observed for the second consecutive month.
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