Tom Denton, Head of Corporate Responsibility at Gatwick, said: "This project gives us an opportunity to further reduce the number of people affected by noise, as well as focus on further reducing CO2 emissions and air-quality impacts.
"Therefore this is an important time for local people and those who live within our flight paths, who now have a once-in-a-lifetime opportunity to give their feedback and influence the future of our airspace."
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An eyewitness said: "It was very unnerving. It was just after 12pm and there were suddenly police vans and cars everywhere."