This idea came from both the GTAA and Helios, which was a consultant that GTAA hired to study noise.
Noise sharing is a method whereby you take problem areas of the GTAA, meaning the east-west runways, and you share that noise. All of a sudden the north-south runways, which are far closer to the airport, get their share of the noise. At the end of the day, Helios, in their final report that was published on September 11, stated that noise sharing is a bad idea. It's taking a problem and making it wider and sharing it. I urge every one of the members of the committee to read that report; it's very important.
Hopefully I answered your question.