In the FAA Reauthorization Act of 2018, Pub. L. 115254, § 188, Congress required the Federal Aviation Administration (“FAA”) to “evaluate alternative noise metrics to current average day-night level standard, such as the use of actual noise sampling to address community airplane noise concerns.” In its April 14, 2020 Report to Congress (“Report”), FAA thumbed its nose at that mandate, and chose instead to enumerate the various available metrics, without any attempt at comparative analysis of their efficacy at representing real world noise impacts when compared to Day/Night Average Sound Level (“DNL”), currently required by FAA for analysis of airport noise impacts.

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