Ten House Democrats called on the Pentagon to reduce air traffic near Reagan Washington National Airport (DCA) after a deadly January midair collision between an Army helicopter and a passenger plane killed all 67 people on board.

The lower chamber Democrats, led by Rep. Don Beyer (D-Va.), called on the Federal Aviation Administration (FAA) and Defense Department (DOD) to permanently lower “significant” air traffic within the area around DCA.

The lawmakers also asked federal agencies to create an alternative route for helicopters that would prevent redirecting traffic over residential areas in the vicinity, review the existing volume in and out of DCA, and that the DOD require pilots within the region of the airport to use ADS-B Out, a tracking system.

“We believe that decreasing the volume of helicopter traffic in the region would alleviate congestion in the airspace and........

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