Continuous Descents Operations (CDOs) mitigate noise by keeping aircraft higher for longer. They can offer noise reductions of between 1 to 5 decibels per aircraft on the approach from between 25 to around 10 miles to touchdown.

We’ve been able to measure the environmental efficiency of the aircraft in our skies for some time now, but until now we haven’t been able to extend that knowledge to planes operating on the ground at airports.