Hartsfield-Jackson Atlanta International has kept its crown as the world’s busiest airport for 2025, handling 106.3 million passengers according to new figures from Airports Council International (ACI), even as its lead over fast-growing rivals in Asia and the Middle East continues to shrink.

For UK business travellers the numbers matter. Atlanta is Delta’s principal hub and a key connecting point for transatlantic itineraries into the American South, while the airports climbing fastest in the rankings, from Dubai to Shanghai, are precisely the hubs British firms rely on to reach Gulf and Asian markets. Busier hubs mean fuller flights, tighter connections and, as ACI itself warns, mounting strain on terminal capacity.

ACI’s World Airport Traffic Dataset puts global passenger numbers at 9.8 billion for 2025, up 3.7 per cent on the previous year and 6.5 per cent above pre-pandemic levels. The 20 busiest airports between them handled 1.59 billion passengers, roughly 16 per cent of all global air travel. Atlanta’s total actually fell 1.6 per cent year on year, yet it was still enough to stay ahead of the pack, a position that helps explain why it features so prominently among the best US airports for business travel.

Asia-Pacific reshapes the rankings

Dubai International took second place with 95.2 million passengers, up 3.1 per cent, while Tokyo Haneda climbed to third on 91.7 million, a 6.7 per cent rise powered by Japan’s international recovery. Dallas/Fort Worth and Shanghai Pudong completed the top five, with Shanghai recording the biggest jump of the group, a 10.7 per cent surge that lifted it from 10th to 5th.

The regional story is unmistakable. Guangzhou Baiyun returned to the global top 10 with 83.6 million passengers, a striking rebound from 57th place in 2022, while Kuala Lumpur jumped six places to re-enter the top 20 for the first time since before the pandemic, helped by stronger links with China and Malaysia’s tourism drive. The contrast with Europe is stark, where Heathrow and Frankfurt both saw June passenger numbers fall amid regional disruption.

Capacity warning for travellers

ACI cautions that the boom is testing infrastructure. “Record demand is exposing growing pressures on capacity,” said ACI World Director General Justin Erbacci, who urged governments and operators to invest now to meet future needs, according to the organisation’s official announcement.

For those flying through Europe’s hubs, that pressure is already visible in longer queues as the EU’s new entry-exit system rolls out. Travellers connecting through the world’s mega-hubs should build extra time into itineraries, particularly at peak periods.

Cargo and movements tell their own story

Air cargo passed 131 million metric tonnes, driven largely by e-commerce. Hong Kong remained the busiest freight hub, with Louisville and Miami posting the fastest growth among the top five. And while Atlanta kept its passenger title, Chicago O’Hare overtook it for aircraft movements, recording more than 857,000 takeoffs and landings, a 10.5 per cent increase that pushed Atlanta into second.

The picture is of an industry no longer recovering but accelerating, with Asia-Pacific’s expansion redrawing the map of global aviation. For UK SMEs booking travel into 2027, the busiest hubs are only going to get busier.