US Aviation Market Data Insights

Find answers to your questions about the US aviation market, with flight data insights and analysis powered by OAG's Schedules Analyser.

Here are some highlights from this month's US market data:

• Largest airline: American Airlines (19.2m seats)
• Busiest airport: Atlanta Hartsfield-Jackson (4.6m seats)
• Busiest US domestic flight route: Atlanta to Fort Lauderdale (285,800 seats)
• State adding most airline capacity: Illinois (+450,300 seats)

The data is updated monthly. Seats are calculated as departing seats (one-way).

• American Airlines remains the biggest carrier in the US this month with 22% of the market, operating 19.2m seats.
• Delta Air Lines and Southwest Airlines represent 19% and 18% share of the market respectively, with 16.6m and 16.3m seats in Feb 26.
• Spirit Airlines decreased capacity by a further 27% vs Feb 25, 853k fewer seats.
• The Big 4 carriers continue to account for 75% of the market.
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• American Airlines added the most seats this month, increasing seats by 761,100 vs Feb 25.
• United Airlines made the second largest capacity increase of 518,400 seats vs last year.
• Percentage wise Breeze continues to increase capacity at the fastest rate of 37% vs Feb 25, followed by LATAM Airlines Group and Avianca with 18% and 17% more capacity respectively.

• The busiest route this month is Atlanta to Fort Lauderdale with 285,800 seats, an increase of 15% capacity vs Feb 25.
• The Denver to Phoenix route made the largest percentage increase of 16% to 268,500 seats.
• Capacity decreased most again on the Honolulu – Kahului route, followed by Los Angeles – San Francisco, declining by 11% and 10% respectively vs Feb 25.
• Capacity on the New York JFK to Los Angeles route reduced by 8%, taking it from first to 4th position in the Top 10.

• The state of Illinois added the most seats this month, with 450,300 additional seats vs Feb 25.
• The state of Florida saw the second largest increase in seats, with capacity increasing by 296,700 seats vs Feb 25.
• Percentage wise capacity in Illinois increased most, up 10.8%, followed by Tennessee, where capacity increased by 8.8% this month.
• The states where capacity decreased most again this month were Nevada, by 232,800 seats, and North Carolina with 128,300 fewer seats vs last year.

To view US flight capacity statistics from 2019-2026, click the button below to download the data.

*As of July 2025, international capacity is reported on a two-way basis (previously one-way departing).