A “hotline” between air traffic controllers at Ronald Reagan Washington National Airport and the Pentagon intended to coordinate aircraft has not worked since March 2022, the Federal Aviation Administration revealed in a congressional hearing Wednesday.

Aviation officials learned of the issue after controllers at National had to order two flights to abandon landing attempts this month due to an Army helicopter heading to the Pentagon.

An FAA official said the hotline, which connects air traffic control at Washington's DCA with the Pentagon, hasn't worked since 2022. An Army helicopter collided with a passenger jet there in January.