American Airlines Vs. Delta Vs. United: Which Has The Busiest Hubs?

American Airlines, Delta Air Lines, and United Airlines are the world’s three largest carriers by flights (and various other measures). They always are. According to Cirium Diio data, the trio has over 15,000 daily movements (takeoffs/landings combined) in November.

Compared to last November, their collective offering has risen by a respectable 5%. An additional 739 daily round-trip services are available. On a simple percentage basis, United has expanded the most, with 6% more services. It has just inaugurated its first flight on a new international route.

American Vs. Delta Vs. United: The Top 10 Hubs

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Only the country’s ten busiest hubs are shown below. If they are not listed, they did not have a sufficient number of movements. With 1,647 daily takeoffs/landings, Delta’s Atlanta hub is first. No one should be surprised. This is despite having 159 seats per flight—more than any other listed hub. This is from the much lower use of regional jets nowadays. Delta has just started the first-ever service from Atlanta to Marrakech.

Despite the carrier’s pole position, only two of its hubs are present, with Detroit coming tenth. With 603 daily movements, its Minneapolis facility ranks 11th. In contrast, four American and four United hubs are featured. Depending on the measure, Denver is ordinarily United’s top hub. But it is not number one for movements. Chicago O’Hare is. But because O’Hare is the hub of two carriers, it is not a fortress for either of them.

Only 1 Of Them Has Shrunk In The Past Year

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Cirium data shows that American has 3% fewer movements at Charlotte, which is the nation’s third-busiest airline hub, than it did last November. The oneworld member’s takeoffs/landings have fallen from 1,251 to 1,209 daily.

This is mainly from reducing frequencies on existing routes. Indeed, compared to November 2024, it has only cut one route: Tulum in February 2025. In contrast, it added low-frequency flights to Governor’s Harbour in December 2024.

The decline in movements is because Charlotte seems to have a distinct lack of capacity. Because of this, it’d be reasonable to assume that flights on RJs would have been reduced. And they have. A year ago, American Eagle had 272 daily RJ movements. They’ve fallen to 257, a drop of 6%. They’ve reduced by twice as much as American’s overall services there. Nonetheless, American still only has 124 seats per flight.

Unlike airports in expensive parts of the country, American’s Charlotte hub benefits from having a very low cost per enplanement. This plays a critical role in helping with profitability, and it makes it much cheaper to funnel passengers through there than elsewhere. And with movements and capacity falling, it might help with the other side of the equation—yields. Charlotte is probably more profitable for American than ever before.

How Did The Other 9 Hubs Do?

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The nine other hubs all have more movements than they did a year ago. American’s offering at Chicago O’Hare has grown by 34%. It now has 872 daily movements there—222 more per day than in November 2024. Over a dozen routes have been added, whether they’re new or simply recommenced. It has just resumed service to San Jose, Costa Rica. The problem is, American’s movements at O’Hare remain down by 6% compared to before the pandemic.

Elsewhere, United has grown O’Hare movements by 13%; American at Miami, Delta at Detroit, and United at Houston are up by 5%; Delta at Atlanta and United at Denver have grown by 4%; United’s Newark offering has expanded by 2%; and American is 1% larger at Dallas/Fort Worth.