How do they decide which runway to use at Heathrow?

Heathrow's two runways generally operate in segregated mode, whereby landings are allocated to one runway and takeoffs to the other. To further reduce noise nuisance, the use of runways 27R and 27L is swapped at 15:00 each day if the wind is from the west.



The selection of runways at London Heathrow (LHR) is primarily dictated by wind direction and the LHR Noise Abatement protocols. Aircraft must take off and land into the wind for safety and lift; since the prevailing winds in the UK are from the west, the airport operates in "Western Preference" about 70% of the time. Heathrow uses a "Runway Alternation" system to provide noise relief to residents in West London. In 2026, the standard procedure involves using one runway for landings and the other for takeoffs, then switching at 3:00 PM daily. However, if "Easterly Operations" are required due to wind, the alternation schedule changes because the infrastructure for landing from the east is different. Air Traffic Control (ATC) also considers runway maintenance schedules and "Tactical Enhanced Arrival Management" (TEAM) during peak congestion, where they may temporarily use both runways for landings. This complex dance of meteorology, environmental regulation, and traffic volume ensures maximum efficiency while attempting to share the noise burden across the surrounding communities.

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Periods of relief from aircraft noise We know that noise from planes can be disruptive to communities around Heathrow. During the day, when planes are landing and taking off to the west (westerly operations), we alternate the use of our two runways to provide local communities with respite.

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Weather, in particular wind speed and direction, is usually the main reason for selecting which runways are used at an airport, the direction aircraft take-off and land, and the flight paths that are used.

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As the required length for runways has grown, Heathrow now has only two parallel runways running east–west. These are extended versions of the two east–west runways from the original hexagram. From the air, almost all of the original runways can still be seen, incorporated into the present system of taxiways.

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After decades of prevarication by both Conservative and Labour governments, in 2015 a definitive airports commission, set up to investigate the issue, came down firmly in favor of creating a third runway northwest of the existing two east-west aligned landing strips.

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Longest Runway in the UK London Heathrow 09L/27R at 12,799ft x 164ft (3,902m x 50m) is currently the longest active runway in the UK.

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You might be thinking that the numbers on this diagram are backwards. On a handheld compass, south is 180 degrees (so 18 in runway terms) and west is 270 (27). But the “W” is numbered 9 because the runway number is connected to the direction the plane is traveling.

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We have two runways, but they can't be used at the same time due to their proximity. This means that our Northern Runway can only be used if our Main Runway is not available. Our Main Runway is 3,316m long and 45m wide. We have two terminals, the North Terminal and the South Terminal.

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The Boeing 747 is considered to have the longest takeoff distance of the more common aircraft types and has set the standard for runway lengths of larger international airports. At sea level, 3,200 m (10,500 ft) can be considered an adequate length to land virtually any aircraft.

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As with other airports worldwide, Heathrow has been experiencing chaos due to staff shortages amid a summer rush as Covid-19 bans are being lifted.

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Heathrow used to have 3 sets of parallel runways. With larger and more powerful planes, this became less important, and in the 60 years I've been using Heathrow, it has just two parallel runways for greater capacity.

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Shigatse Peace Airport, China (runway length: 5,000m) Shigatse Peace Airport (RKZ), a dual-use military and civilian airport in Shigatse, Tibet hosts the longest runway in the world. The new runway (09/27) stretches 5,000m (16,404 ft) long with a 60-meter asphalt overrun at each end.

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The airfield is managed by three FAA air traffic control towers. O'Hare has a voluntary nighttime (22:00–07:00) noise abatement program. Currently, O'Hare has the most runways of any civilian airport in the world, totaling eight.

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The letters, differentiate between left (L), right (R), or center (C) parallel runways, as applicable: For two parallel runways “L” “R.” For three parallel runways “L” “C” “R.”

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As Atlas Obscura explains, the numbers that runways have aren't arbitrary. A runway always has a number between 1 and 36, and that number isn't just the runway's nickname, but also indicates how many degrees away that runway is from magnetic north, rounded to the tens.

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Almost all of the major airports in the United Kingdom are single-runway (or functionally-single-runway) installations, with only two of the very busiest (Heathrow and Manchester) having as many as two runways (although Heathrow has a third under construction).

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Atlanta Hartsfield-Jackson International Airport remains the busiest airport in the world with 5.2 million seats in September 2023. The composition of the Global Top 10 Busiest Airports is also the same as last month but there are a few changes to the rankings.

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