Incheon Airport

The plane drops lower and lower, and beneath the window there is still only water.

Water, then more water, then still more water. It is close enough now to make out each wave. At most airports in the world, there would be houses below by this point, and fields, and roads.

Then the wheels touch the ground.

That strange feeling comes from one simple fact. This airport was built in a place where nobody would normally put an airport.

The story begins with a problem that many capitals around the world share, and very few have solved neatly.

A big city needs a big airport. A big airport needs land, and a great deal of it: very wide, very flat, and with no homes on it. But around a crowded capital, every spot is already taken. There are houses, fields, roads, and some family's graveyard.

So the question was where to put it.

South Korea came up with an answer that sounds a little upside down at first. Put it where there was no land yet.

Off the west coast, out at sea from the city of Incheon, two islands sat close together. One was called Yeongjong, the other Yongyu. Between them lay a stretch of shallow sea.

The decision was made to fill in that shallow sea.

That is quick to say, but the job was enormous. Filling in the sea is not a matter of dumping a few truckloads of earth. It means carrying soil and rock out into the water, day after day, year after year, until the water draws back. Then a new piece of ground rises, wide enough to hold an entire international airport.

Once the water between the two islands was filled, they were two islands no longer. They joined into one new body of land, and on that new land the airport was built.

Work began in November 1992.

The original plan was to finish in 1997. But that very year the Asian financial crisis struck, and the work slowed down.

In the end, construction took eight years, plus six months of trial runs before anyone dared to open the doors.

Those six months of trials are a detail worth pausing on. They mean the work was already done. The runways were there and the terminal was built, and still the airport stayed closed.

For half a year the airport stood there and was put through its tests before it took real passengers. Later on, hundreds of thousands of people would pass through it every day. For a place like that, half a year of extra waiting was a very small price.

On March 29, 2001, Incheon Airport received its first flight. It replaced Gimpo Airport, which had become overcrowded.

Now for just how big this airport is.

Terminal 1 covers 496,000 square meters. It is the largest terminal in South Korea, with 47 boarding gates. Some of those gates are big enough for the Airbus A380, the largest passenger plane in the sky.

Terminal 2 opened later, on January 18, 2018.

Counting Concourse A, the whole airport has 111 boarding gates.

With that many gates spread over such a wide piece of ground, nobody could walk between them all. So a train runs underground, just to carry passengers between the terminal and a separate block of gates in the middle of the airport. In other words, the airport has a transport system of its own, like a small city with its own railway.

In 2024, the airport handled more than 71 million passengers. That made it 13th in the world and 7th in Asia. For cargo it ranked even higher: 6th in the world and 3rd in Asia.

More than 71 million passengers, in a place that 40 years ago was still open water.

There is one more thing to say about the choice of this site, because it was not only about a shortage of land.

A big airport is loud. Planes take off and land day and night, and the noise carries a long way. An airport in the middle of a crowded area means tens of thousands of families living with that roar every night.

Put it out at sea, and the noise falls on the water.

From the airport, Seoul lies 48 kilometers to the east.

For travelers flying in from Da Nang, the trip has a rhythm all its own. The plane takes off late at night, when everyone at home is already asleep. On board the lights go out, and people try to doze sitting up. Then, about four hours later, the window begins to brighten. The plane comes down in a place with different weather, a different season, a different language.

So go back to the moment at the start, when the wheels had just touched the runway after a long stretch of nothing but water.

The edge the plane crossed just before that was not a natural coastline.

It was the place where, decades ago, people looked out at the water between two islands and decided that this would become land.

And on the way home, as the plane lifts away from Incheon, a window seat gives one last view. Just after takeoff, look down and find those two islands.

Now they are no longer two.