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Blame it on one very simple Federal law: ANCA , the Airport Noise And Capacity Act Of 1990. We keep trying to write a brief history of how all airport law regarding noise and pollution got subsumed from where it was (the EPA) into the FAA, but all people seem to really care about these
Appendix I from the 2013 Part 150 Study by Landrum & Brown. A Letter Of Agreement (LOA) where the Port Of Seattle agrees to using the Third Runway primarily for overflows and bad weather. Note the very official looking signature of the Port CEO, Tay Yoshitani. Also note that it is described as an ‘informal