WASHINGTON (AP) – Members of Congress from Maryland and other local leaders are calling for a study of noise levels from planes flying to and leaving Ronald Reagan Washington National Airport.

The Federal Aviation Administration made changes to air traffic patterns in 2015 that concentrated more airliners along a single flight path. Since then, some residents of Bethesda and northwest Washington have complained about near-constant noise.

Sen. Ben Cardin, Reps. John Delaney and Jamie Raskin and other officials requested the noise study in a letter to the FAA on Monday. They want the FAA to look at noise levels before and after the traffic pattern changes. They say their constituents “suffer the disruptive and unhealthy effects” of airplane noise on a daily basis.

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