Schools around Heathrow are to be offered improved insulation to help counter the din of passing aircraft.
The airport is rolling out the offer to 24 schools , at which it has already paid for noise insulation.
It says the work will be "phased in" over the next three years, allowing schools to keep windows closed and shut out the roar of jets without classrooms becoming too stuffy.
The offer will be open in the first phase to 17 schools in Hounslow and one in Ealing , and in future stages to six schools in Slough, Spelthorne, Windsor and Richmond.
Heathrow said the average cost would be £1.5m per school, adding up to a total of £36m.
'Classes now much more comfortable'
The programme was announced on Monday at Hounslow Heath Infant and Nursery School, which is one of two schools in Hounslow where a pilot ventilation scheme has been undertaken.
Headteacher Kathryn Harper-Quinn said the new windows had "significantly" reduced noise, and the ventilation meant classes were now "much more comfortable throughout the year".
Heathrow last year finally fulfilled its £4.8m commitment to insulate 42 schools and other community buildings against noise - a decade after that promise was first made.
It said the noise insulation, including double-glazing and replacement windows, had reduced noise by six decibels on average.
The airport has also provided £1.8m to install adobe huts, used elsewhere as earthquake shelters , so pupils at 21 primary schools can benefit from more outdoor lessons.
'Essential part of efforts to become a better, quieter neighbour'
Heathrow's director of environment, Matt Gorman, said: "The multi-million pound investments Heathrow has and is still making in classroom insulation and outdoor learning are an essential part of our efforts to become a better, quieter neighbour.
"We know many of these local students will be part of our airport team in the future, and we want to be able to provide them and their colleagues with a first-class learning environment."
His comments came as Hounslow MP Ruth Cadbury denounced Heathrow as a "poor neighbour" during a parliamentary debate about noise pollution last Wednesday (April 20).
"The third runway would bring a 46% increase in flights. This will result in more residents suffering from lack of sleep and more children who have their learning experience compromised by noisy flights over their classrooms," she said after the debate.
"Heathrow should listen to residents' complaints and become a better neighbour, not a bigger one."
Heathrow has set aside £700m to provide noise insulation for 160,000 extra homes should a third runway get the go-ahead, but anti-expansion campaigners claim the true cost would be closer to £1.8bn .
The campaign group Back Heathrow was recently censured by the advertising watchdog for a 'misleading' advert which claimed most people living near the airport supported its expansion.
