The Biggest Airlines in The US

**Updated May 2024**

Which are the biggest airlines in the US this month? Using our Schedules Analyser, we've brought together data to establish the top 10 biggest airlines based on the number of departing seats in the schedules.

Infographic: The Biggest US Airlines in May 2024

Biggest US Airlines Infographic May 24


Top Ten Biggest US Airlines Operating 96 Million Seats

US airlines have 105 million seats in the schedule for May 2024, with the top 10 busiest US airlines operating 96 million of these.


73% of US Airline Capacity Provided By The Big Four

The "big four" US airlines - American Airlines, Southwest Airlines, Delta Airlines and United Airlines - have by far the most capacity, accounting for 73% of US airline seats, a total of just under 78 million between them.

The biggest US airline based on seats, American Airlines, accounts for just under 23% of capacity in the top ten, followed by Southwest, with 20%, then Delta Airlines with 19,258,864 seats, 20% of the top ten's capacity. The fourth biggest airline in the US, United Airlines has 15,874,547 seats in the schedule (17%).

The gap between the fourth busiest US airline and the fifth, Alaska Airlines, is 11m seats.

Frontier is the 7th biggest airline but has added the most capacity, percentage-wise, month on month, increasing by 10% (over 340,000 seats.

Our US Aviation Market Dashboard is updated each month. As well as the biggest US airlines, we track the busiest airports and look at which states are adding capacity. View the dashboard now. >>

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