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.

A hotline that directly connects the Pentagon to the air traffic control tower at Ronald Reagan Washington National Airport hasn’t been operational since March 2022, an US Federal Aviation Administration official said.

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.