Elijah Nouvelage/Reuters
No. 1 Hartsfield-Jackson Atlanta International Airport: The pride of Georgia reclaimed its title of world's busiest airport for passenger traffic in 2021, handling about 75.7 million people. Click through the gallery to see photos of the next nine busiest airports in the world in 2021.
Cooper Neill/The New York Times/Redux
No. 2 Dallas-Fort Worth International Airport: Travelers crowd the airport on November 20, 2021, ahead of the Thanksgiving travel rush. The airport saw around 62.5 million passengers in 2021.
David Zalubowski/AP
No. 3 Denver International Airport: Travelers line up at a security checkpoint on December 26, 2021. US airports dominate the 2021 list thanks to a strong rebound in domestic flights.
Spencer Platt/Getty Images
No. 4 O'Hare International Airport: People walk through Chicago's O'Hare on April 26, 2021. Passenger traffic was up 75% from 2020.
Mario Tama/Getty Images
No. 5 Los Angeles International Airport: People wait in line to check in for their flights in the international terminal on December 21, 2021. In the early weeks of the pandemic back in 2020, LAX saw a 95% drop in air travel, sending economic shock waves through the city.
Kirby Lee/AP
No. 6 Charlotte Douglas International Airport: People walk through the B Concourse terminal at the airport of North Carolina's largest city on April 30, 2021. It saw roughly 43.3 million passengers.
Paul Hennessy/SOPA Images/Shutterstock
No. 7 Orlando International Airport: Travelers wait in line for TSA security screening at the beginning of the July 4th holiday weekend in 2021.
Markus Mainka/imageBROKER/Newscom
No. 8 Guangzhou Baiyun International Airport: This was the world's busiest airport for passengers in 2020, when China's domestic market saw an earlier rebound than other countries. But Atlanta reclaimed its traditional No. 1 spot for 2021.
Markus Mainka/imageBROKER/Newscom
No. 9 Chengdu Shuangliu International Airport: Chengdu is a thriving city in China's central interior. If you're wondering why Beijing isn't in the top 10, it is now serviced by two major airports that split the traffic in and out of the capital city.
STRF/Star Max/IPx/AP
No. 10 Harry Reid International Airport: This busy gateway to Las Vegas got a name change in December 2021 to honor Nevada's longstanding US senator. For decades, it was called McCarran International Airport. It saw roughly 39.8 million passengers in 2021, up 79% from 2020.

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CNN  — 

Move over, Guangzhou. Georgia’s Hartsfield-Jackson Atlanta International Airport is once again the world’s busiest airport.

The US airport was knocked off its No. 1 perch to the No. 2 slot in passenger volume in 2020 by Guangzhou Baiyun International Airport in China, breaking the Atlanta airport’s 22-year streak in the top slot.

01:23 - Source: CNN
Still world's busiest airport

But in the 2021 rankings released on Monday by trade association Airports Council International, ATL is back on top, a sign of recovery from 2020’s precipitous plunge in air traffic as the pandemic took hold.

In 2021, the Atlanta airport saw 75.7 million passengers. That figure is up a whopping 76% from 2020 but still nearly 32% below pre-pandemic 2019 figures.

Guangzhou’s airport dropped to No. 8 in 2021, with 40.3 million passengers. Another airport in China, Chengdu’s Shuangliu International Airport, is ninth on the 2021 list, down from No. 3 in 2020.

US airports dominated the passenger traffic rankings in 2021, with eight of the top 10 in the United States.

Dallas/Fort Worth International Airport in Texas was the second-busiest in 2021, with about 62.5 million passengers, and the international airport in Denver, Colorado, ranked third, with 58.8 million passengers.

Chicago’s O’Hare and Los Angeles International rounded out the top five.

The list shows “an encouraging trend of recovery,” Luis Felipe de Oliveira, ACI World’s director general, said in a statement.

“Although we are cautious that recovery could face multiple headwinds, the momentum created by reopening plans by countries could lead to an uptick in travel in the second half of 2022,” de Oliveira said.

In 2021, there were an estimated 4.5 billion passengers globally, according to ACI. That figure represents a nearly 25% increase from 2020 but more than 50% drop from 2019.

Tian Jianchuan/Xinhua/ZUMA Press
Baiyun International Airport in Guangzhou, China, edged out Atlanta's international airport in 2020 as the world's busiest. In 2021, Guangzhou's airport dropped to No. 8.

US and China switch places

Given the much faster recovery of domestic travel compared with international travel, airports that were way down the list of the world’s busiest airports pre-pandemic have leaped up into the top 10.

The airports in Charlotte, North Carolina (No. 6); Orlando, Florida (No. 7); and Las Vegas (No. 10) are new to the top 10 this year. Vacation magnets Orlando and Las Vegas were No. 31 and No. 30 for passenger traffic before the pandemic in 2019.

The United States’ strong showing in the top 10 is a reversal from 2020, when airports in China took seven of the top 10 slots.

China’s dominance in 2020 was because of the early rebound of domestic travel in China. The country still has not reopened to international visitors.

“If we look back on 2020, China was one of the first to come out of the initial waves of the pandemic and it actually almost reached a full recovery by the end of 2020,” said Patrick Lucas, ACI World’s vice president for economics.

But in 2021, domestic traffic in China dropped significantly with renewed lockdowns, while the United States saw a big jump.

The United States has the world’s largest domestic travel market, followed by China.

Airports that routinely landed in the top 10 of the world’s busiest airports list – such as Dubai International, London Heathrow and Paris Charles de Gaulle – have been absent during the pandemic.

“Those markets that had very high proportions of international traffic were of course hurt as a result of all these restrictions and quarantine requirements,” Lucas said.

The significant role of international traffic is also part of the reason that Beijing’s Capital and Shanghai’s Pudong International airports have dropped out of the top 10. Beijing Capital – once routinely No. 2 in passenger traffic – is also seeing its traffic split by the city’s new Daxing International Airport.

Elena/Adobe Stock
Dubai International Airport, which sees a large proportion of international traffic, dropped out of the top 10 busiest airports in 2021. However, it remained No. 1 for international passengers in 2021.

Rolling back restrictions

ACI is advocating a “risk-based approach” to easing travel restrictions, following Covid-19 data, Lucas said.

“Vaccines actually have been the passport to travel, but as we can see now, many major markets are opening up and … a lot of countries have come to realize that curbing travel or imposing travel restrictions actually does not do anything,” he said.

“If anything, it creates even more harm. So meaning that it disrupts the socioeconomic gains of air transport and tourism and so on.”

As it stands, ACI expects total passenger traffic numbers to recover to pre-pandemic levels in 2024.

However, strong domestic markets, including the United States, are expected to recover by 2023. And markets with a high proportion of international traffic aren’t expected to rebound until 2025, Lucas said.

Globally, there are “different forces moving in opposite directions.”

There’s very strong pent-up demand and the lifting of restrictions that have dampened travel versus the rising cost of travel and geopolitical concerns related to what’s happening in Eastern Europe, Lucas said.

But overall, ACI is upbeat. “We have a sense that consumers, passengers, will bite the bullet, so to speak, despite the rise in the cost of travel.”

Elijah Nouvelage/Reuters
Hartsfield-Jackson Atlanta International Airport says it is within a two-hour flight of 80% of the US population.

World’s top 10 busiest airports for passenger traffic in 2021

1. Atlanta (ATL): 75.7 million passengers, up 76% from 2020

2. Dallas/Fort Worth (DFW): 62.5 million passengers, up 59% from 2020

3. Denver (DEN): 58.8 million passengers, up 74% from 2020

4. Chicago O’Hare (ORD): 54 million passengers, up 75% from 2020

5. Los Angeles (LAX): 48 million passengers, up 67% from 2020

6. Charlotte (CLT): 43.3 million passengers, up 59% from 2020

7. Orlando (MCO): 40.4 million passengers, up 87% from 2020

8. Guangzhou (CAN): 40.3 million passengers, down 8% from 2020

9. Chengdu (CTU): 40.1 million passengers, down 1.5% from 2020

10. Las Vegas (LAS): 39.8 million passengers, up 79% from 2020