As of Oct. 31 (the end of fiscal year 2021), noise mitigation projects account for $3.56 billion of the $116.6 billion in Passenger Facility Charges (PFC) revenue that airports have collected since 1991, according to FAA data. A total of 109 airports were using PFCs for noise mitigation projects as of Oct. 31, 2021, the same number as in the previous three years.
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