This list is hot and fresh and updated 5th April, 2018.
We chronicled on this thread (https://www.nairaland.com/4290401/100-most-visited-cities-world) cities most visited in the calendar year 2017.
We are now taking it further by showing the airports that are the biggest in terms of size and in terms of number of passengers that landed or transited via these airports

The Top 12 Biggest and Busiest Airports in the World
Updated on April 5, 2018
With the need to transport ever-increasing numbers of people and goods, many airports are expanding, but only 12 can lay claim to the titles of biggest and busiest. Though the airports in this article are ranked according to passenger traffic, it is important to note that in addition to shuttling people, they are responsible for transporting a significant portion of the planet's cargo

Seun, lalasticlala and Mynd44. Next time you travel through one of these airports, stop for a second to think about how impossibly large its daily operations are. It is simply amazing how they manage to solve enormous logistical challenges each and every day while getting you and your baggage where you're going in a timely and efficient manner.

This is a list of the largest and busiest airports in the world, ranked by the total number of passengers that depart or arrive in one year. Continue scrolling for more information

The 12 Biggest and Busiest Airports in the World
Hartsfield-Jackson Atlanta International Airport (ATL)
Beijing Capital International Airport (PEK)
Dubai International Airport (DBX)
Tokyo International Airport (Haneda Airport) (HND)
Los Angeles International Airport (LAX)
O’Hare International Airport (ORD)
Heathrow Airport (LHR)
Hong Kong International Airport (HKG)
Shanghai Pudong International Airport (PVG)
Paris Charles de Gaulle Airport (CDG)
Amsterdam Airport Schiphol (AMS)
Dallas/Fort Worth International Airport (DFW)

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1. Hartsfield-Jackson Atlanta International Airport (ATL)
Hartsfield-Jackson Atlanta International Airport in Georgia, USA is the world's busiest airport. It is the only airport to serve over 100 million passengers yearly, and has done so for three years running! Chances are that you or someone you know has passed through Hartsfield-Jackson, as it is the largest connections hub in North America

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2. Beijing Capital International Airport (PEK)
Beijing Capital International Airport is the largest and busiest airport in Asia and the second largest worldwide, with 95,786,296 passengers in 2017.

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3. Dubai International Airport (DXB)
Dubai International Airport has seen a massive surge in growth over the past several years, increasing passenger traffic by 5.5% last year alone. It has pushed ahead of Tokyo International, previously the world’s third largest airport.

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4. Tokyo International Airport (HND)
The Tokyo International Airport (also known as Haneda Airport) ranks as the fourth largest airport in the world. In 2017, a whopping ‎84,956,964 people passed through Haneda Airport. It continues to see growth in passenger traffic and expand to accommodate it.

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5. Los Angeles International Airport (LAX)
Coming in fifth, though just barely, is Los Angeles International Airport. It is the second largest airport in the U.S. and the only airport in the world that all three U.S. legacy carriers (American, Delta, and United) have chosen as a hub. It is also a hub for Alaska Airlines, Virgin America, and Atlas Air (a cargo airline).

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6. Chicago O'Hare International Airport
O'Hare International Airport, located in northwestern Chicago, is the third largest airport in the US. In 2017, 79,828,183 passengers passed through O'Hare International, making it the sixth busiest airport in the world. In fact, O'Hare was the world's busiest airport until 1998, when it was ousted by Atlanta's Hartsfield-Jackson


Source: https://wanderwisdom.com/transportation/Top-5-Largest-Airports-in-the-World

7. London Heathrow Airport
London Heathrow Airport is the busiest airport in Europe and the seventh busiest in the world with an impressive 78,012,825 passengers in 2017. Heathrow boasts 81 airlines and serves 204 destinations in 85 countries. Heathrow Airport is also the hub for one of the world's largest and most influential airlines—British Airways.

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8. Hong Kong International Airport (HKG)
Hong Kong International Airport, also known as Chek Lap Kok Airport, was built to replace Kai Tak Airport (the original Hong Kong International Airport) and opened in July 1998. Kai Tak, built in 1925 and located in a dense urban area, possessed just one runway (which was notoriously dangerous, and a true test of skill for any pilot who had to touch down there).

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9. Shanghai Pudong International Airport (PVG)
Shanghai Pudong was opened in 1999 to ease pressure on Shanghai's other airport, Hongqiao, and has since become one of the busiest airports in China. Hongqiao is still a major airport, but it serves primarily domestic flights, whereas Pudong has both domestic and international flights. It is located just under 20 miles east of Shanghai's city center.

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10. Paris Charles de Gaulle Airport (CDG)
Charles de Gaulle Airport is the second largest in Europe and can handle an astounding 120 aircraft movements per hour thanks to its innovative parallel runway system. This system involves two pairs of parallel runways designed in such a way that they are able to be used independently. Each pair has one runway designed for take-off and another for landing, which increases the number of flights they can accommodate per hour while reducing air traffic-related noise pollution.

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11. Amsterdam Airport Schiphol (AMS)
Amsterdam Schiphol has a single-terminal design split into three departure halls, which is unusual for such a large hub. It also employs a unique baggage system, with six robots that load the baggage containers in the South Hall. Schiphol has five main runways, and 90 gates, and can accommodate a maximum of 106 arrival and 110 departure movements per hour.

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12. Dallas/Fort Worth International Airport (DFW)
Twelfth and last on our list is DFW International Airport. It has 165 gates and serves 229 destinations. It provides 228,000 full-time jobs with an overall payroll of $12.5 billion. Its location is unique in that every major city in the continental US can be reached by plane in four hours or less—nothing to sneeze at in a country nearly 3,000 miles from end to end.

See the number of passengers that visited in 2017

Airport Hartsfield-Jackson
Location: Atlanta, GA (USA)
Total Passengers in 2017 103,902,992
Number of Runways 5

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Airport Beijing Capital
Location: Beijing (China)
Total Passengers in 2017 ‎95,786,296
Number of Runways 3

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Airport Dubai International
Location: Garhoud (Dubai)
Total Passengers in 2017 ‎88,242,099
Number of Runways 2

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Airport Tokyo International
Location: Tokyo (Japan)
Total Passengers in 2017 ‎84,956,964
Number of Runways 4

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Airport Los Angeles International
Location: Los Angeles, CA (USA)
Total Passengers in 2017 ‎84,557,968
Number of Runways 4

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Airport O’Hare International Airport
Location: Chicago, IL (USA)
Total Passengers in 2017 ‎79,828,183
Number of Runways 8

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Airport Heathrow Airport
Location: London (UK)
Total Passengers in 2017 ‎78,012,825
Number of Runways 2

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Airport Hong Kong International Airport
Location: Hong Kong (China)
Total Passengers in 2017 ‎72,867,000
Number of Runways 2

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Airport Shanghai Pudong International Airport
Location: Shanghai (China)
Total Passengers in 2017 70,001,237
Number of Runways 5

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Airport Paris Charles de Gaulle Airport
Location: Roissy-en-France (France)
Total Passengers in 2017 69,471,442
Number of Runways 4

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Airport Amsterdam Airport Schiphol
Location: Haarlemmermeer (The Netherlands)
Total Passengers in 2017 68,515,425
Number of Runways 6

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Airport Dallas/Fort Worth International Airport
Location: Dallas-Fort Worth, Texas
Total Passengers in 2017 67,092,224
Number of Runways 7

I bet you, Nigeria don't have a record for the no of passengers coming through or going out from the busiest airport in our country, MMA Ikeja.

AdiscoPele:
I bet you, Nigeria don't have a record for the no of passengers coming through or going out from the busiest airport in our country, MMA Ikeja.

You are very correct. I can assure you millions visit Nigeria within one month, but bureau of statistics and Immigration have to proper records