Note how the further the plane is from Brisbane Elementary School, the lower the average noise. Note the number above each column is the number of events at that distance.
Question: How to reduce noise events over 65DB in Brisbane?
One answer: Push the planes so that they are a minimum of 5,000 feet away from Brisbane Elementary School. Assuming the plane is at 3,000 feet above the ground, this is 4,000 horizontal feet from Brisbane Elementary School. This is the same conclusion as the first slide. (This does not apply for those pesky noisy flights from Oakland.) This gets rid of 33 of the 43 events over 65db.