Heathrow Airport

Heathrow Airport is the primary international gateway for London and the United Kingdom.

It stands as the largest of six international airports within the London airport system. While other airports like Gatwick and Stansted serve the region, Heathrow remains the most significant hub. In 2025, it was recognized as the busiest airport in Europe. It also held the title of the fifth-busiest airport globally by passenger traffic. Furthermore, it ranked as the second-busiest airport in the world for international passenger traffic. In 2024, Heathrow recorded the highest number of international connections of any airport on Earth.

Managing the movement of aircraft requires a highly organized sequence of steps.

Inbound aircraft typically follow Standard Arrival Routes, known as STARs. These routes lead to four specific VOR installations. These installations define four "stacks," which act as aerial waiting areas for planes. Air traffic controllers at Approach Control in Swanwick, Hampshire, manage these aircraft. They merge the planes from the four holding stacks into a single, orderly stream of traffic. To reduce environmental impacts, controllers often use continuous descent approach techniques. Once a plane is on its final approach, control is transferred to the Heathrow Tower.

The physical layout of the airport has evolved significantly over several decades.

In the 1950s, the airport featured six runways arranged in a hexagram shape. These three pairs of runways were set at different angles. Two runways were always positioned within 30 degrees of the wind direction. Today, the airport has transitioned to two parallel east-west runways. These modern runways are extended versions of the original east-west paths. Interestingly, much of the old runway system is still visible from the air. These former runways have been incorporated into the current taxiway system.

Heathrow is a massive operation serving a diverse global network.

The airport is used by more than 89 different airlines. These carriers fly to 214 destinations across 84 countries. In 2021, the airport served 19.4 million passengers. This included 17 million international travelers and 2.4 million domestic passengers. The most successful year in its history was 2024, with 83.9 million passengers. One of the busiest routes connects Heathrow to New York's JFK Airport. In 2021, over three million people traveled between these two specific locations.

The airport is organized into several distinct functional areas.

There are four operational passenger terminals, numbered 2 through 5. In addition to these, there is one dedicated cargo terminal. The cargo operations are quite large, handling 1.4 million tonnes of goods in 2022. Common exports include books, salmon, and medicine, with major destinations being the United States, China, and the United Arab Emirates. The airport also serves as the primary hub for British Airways and Virgin Atlantic. This infrastructure supports a massive flow of both people and commercial goods.

Noise management is a critical part of Heathrow's daily operations.

To minimize noise for residents, the airport uses runway alternation. During westerly operations, aircraft take off to the west and land from the east. This helps avoid flying directly over the most densely populated areas. The airport also swaps the use of runways 27R and 27L at 15:00 local time daily. Night-time flights are strictly regulated between 23:00 and 04:00. During this period, the noisiest aircraft types are not allowed to operate. A Quota Count system also limits the total amount of noise permitted at night.

Heathrow has a long history of growth and regulatory change.

It began as a small airfield in 1930. It officially opened as London Airport on 25 March 1946. The name was changed to Heathrow Airport in September 1966 to avoid confusion with Gatwick and Stansted. The Central Terminal Area was designed by Sir Frederick Gibberd. Over time, the Civil Aviation Authority has regulated the fees airlines pay to land. Additionally, the allocation of landing slots is managed by Airport Co-ordination Limited. These rules ensure the airport functions efficiently within the global aviation system.