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.

A hotline connecting the Pentagon and Federal Aviation Administration air traffic controllers at Reagan Washington National Airport has been inoperable since March 2022, an FAA official told a Senate committee on Wednesday.