A federal appeals court is set to hear arguments in two cases over noise complaints at Phoenix Sky Harbor International Airport.
The Arizona Republic reports the cases will go before the court in Washington, D.C. on Friday.
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The city of Phoenix filed its lawsuit against the Federal Aviation Administration in 2015 after the agency changed flight paths at the airport as part of a national program for safety and efficiency. The city claimed the new routes significantly increased noise in several neighborhoods.
Neighborhood associations filed their own complaint against the FAA months later.
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Both complaints ask the court to find the agency at fault for how it went about changing the flight paths.
The FAA previously argued it consulted with a variety of Phoenix agencies before making the changes.