In a marked change in longtime Federal Aviation Administration (“FAA”) policy regarding analysis of noise and air quality impacts from FAA initiated, directed or funded projects, FAA has substituted a single new model for the long mandated Integrated Noise Model (“INM”) and Emissions and Dispersion Modeling System (“EDMS”). Beginning May 29, 2015, FAA policy “requires” the use of the Aviation Environmental Design Tool version 2b (“AEDT 2b”), which integrates analysis of aircraft noise, air pollutant emissions, and fuel burn. These impacts, according to FAA are “interdependent and occur simultaneously throughout all phases of flight.” 80 Fed.Reg. 27853.
On August 19, 2014, the Federal Aviation Administration (“FAA”) published a proposed rule regarding “Implementation of Legislative Categorical Exclusion for Environmental Review of Performance Based Navigation Procedures,” 79 Fed.Reg. 49141 (“CATEX Rule”) to implement the Congressional mandate contained in the FAA Modernization and Reform Act of 2012, Pub.L. 112-95 (“FRMA”), § 213, directing FAA “to issue and file a categorical exclusion for any navigation performance or other performance based navigation (PBN) procedure that would result in measureable reductions in fuel consumption, carbon dioxide emissions, and noise on a per flight basis as compared to aircraft operations that follow existing instrument flight rule procedures in the same airspace.” 79 Fed.Reg. 41941.