Are new planes really quieter?

New planes are quieter, and not by a little. The question most people are really asking is a different one: why doesn't it sound like it from my garden? Both answers are true at once, and the gap between them explains a lot about living near an airport.

Yes: each flight is quieter than it was

Measured at the same noise monitors around Heathrow, the Airbus A350 is up to 6 dB quieter on take-off than the Airbus A330 and Boeing 777 it replaces, and up to 9 dB quieter than the four-engined A340, according to the Civil Aviation Authority. On landing the gain is smaller: up to 3 dB.

The same pattern shows up in the short-haul jets that make most of the flights. The UK's night quota system scores each aircraft on its certified noise, in bands 3 dB wide. An Airbus A320 typically sits two bands higher than an A320neo on take-off and one band higher on landing, so the neo is roughly 6 dB quieter leaving the airport and 3 dB quieter arriving. Our guide to the loudest and quietest passenger planes compares the common types one by one.

Across a whole airport the effect is real. Heathrow handled about 1,300 flights a day in 2024, almost exactly as many as in 2006, yet the area inside its 55 dB Lden contour shrank by 39%, from 245 km² to 148 km². Much of the change came from retiring the Boeing 747-400, which had shaped Heathrow's contours for years: 135 movements a day in 2006, about one a day in 2024. By then, types that were not yet flying in 2006, such as the A350, 787 and A320neo, made up 49% of Heathrow's flights.

How the noise standards have tightened

New aircraft have had to meet noise limits since around 1970. The limits are set by the International Civil Aviation Organization (ICAO) in Annex 16 to the Chicago Convention, in numbered chapters, and each new chapter is stricter than the last.

Chapter 16 was adopted by the ICAO Council on 27 March 2026. The US applies the same limits under its own names: Stage 4 matches Chapter 4, and Stage 5 matches Chapter 14.

Two things make these numbers smaller than they look:

• The margins are cumulative. An aircraft is measured at three points: under the approach 2 km before the runway, 450 m to the side of the climb after take-off, and under the climb 6.5 km from the start of the take-off run. The 7 dB of Chapter 14 is the three margins added together, so each point improves by a few decibels.
• They apply only to new designs. A type certified under an older chapter can keep being built and flown. The aircraft flying in Europe are 11.8 years old on average, and that age is rising. EASA reports that the noise margins of new jet deliveries have flattened out in recent years: the A320neo, A350, 737 MAX and 787 all date from the 2010s, and the improvements since have been marginal.

Standards do not take old aircraft out of the sky; phase-outs do. In the US, every jet over 75,000 lb flying in the lower 48 states had to meet Stage 3 by the end of 1999.

How much quieter is "quieter"?

Decibels do not add up the way people expect. The Civil Aviation Authority's rule of thumb: 3 dB is the smallest change most people notice in normal listening, and 10 dB sounds about half as loud.

So a 6 dB quieter take-off is a real, audible improvement. But it takes a jet that peaked at 80 dB over your garden down to 74 dB, not to silence, and still well above 65 dB, the level at which a plane interrupts a conversation.

Why many people don't hear a difference

More flights

Each doubling of flights adds 3 dB to the average noise. A fleet that is 3 dB quieter per flight, flying twice as often, leaves the average where it started, and the number of noise events has doubled. Flights at airports in the EU and EFTA countries reached 8.35 million in 2023, and EASA's forecasts range from 9.4 to 13.8 million a year by 2050. Between 2019 and 2023, noise exposure rose at about a third of the 98 major European airports that EASA tracks. If your area has had a sudden increase, see why you might get more planes than last year.

Concentrated routes

Modern navigation lets aircraft follow a route precisely. The Civil Aviation Authority notes that technology brought in for safety and efficiency has concentrated departing flights onto a small number of routes. Fewer people are overflown, but those under the routes get every flight instead of a share. At Heathrow, the area with frequent loud flights west of Windsor Forest grew between 2006 and 2024, mainly because one set of westerly departure routes carried 42% more flights.

The busiest places gain least

Heathrow also counts how many people hear aircraft above 65 dB (N65) on an average day. From 2006 to 2024, the number of people with at least 50 such events a day fell by a third. The number with at least 200 a day fell by only 6%. Close to the runway and under the approaches, a quieter plane still passes low and loud, so the count of loud events barely moves. And more people now live inside Heathrow's 50 and 55 dB night contours than in 2006, because more homes have been built around the airport.

The rumble counts for little in the figures

Noise figures are weighted towards the frequencies the ear hears best: the A-weighting in dBA discounts low and very high frequencies, which we are less sensitive to. Yet low-frequency rumble needs particular attention when a home is insulated: the FAA's insulation guidance uses a separate rating for windows to make sure low-frequency noise is reduced enough. An improvement in the headline decibels says little about whether the deep rumble you hear indoors has changed.

People are more annoyed than they used to be

A review of surveys from 2000 to 2014 for the World Health Organization found more people highly annoyed by aircraft noise at the same average level than in older studies, and more annoyance where an airport's operations had recently changed. The FAA's national survey, published in 2021, found 60% to 71% of people highly annoyed at 65 dB DNL, against 12% on the curve behind its policy. Quieter planes are arriving, but tolerance is not holding still.

What to expect next

Chapter 16 will apply to new aircraft types certified from 2029, which will then take years to reach airline fleets. ICAO expects it to take more than a million people out of the areas above 55 dB DNL between 2032 and 2048. EASA expects fleet renewal to reduce total noise exposure in Europe over the next twenty years, but warns that the trend may differ significantly from one airport to another.

For any one home, the fleet average matters less than three local facts: how many planes pass, how low, and at what time. Averages hide all three, which is why we count loud planes instead. To see how many fly over a street today, replay a day on our free flight map.