https://lite.cnn.com/2025/05/14/us/air-traffic-control-hotline-between-pentagon-and-reagan-washington-national-airport-has-been-broken-since-2022
"The FAA was not aware the direct line was broken until a May 1 incident where a helicopter circled the Pentagon and caused two flights to abort landings, Franklin McIntosh, the FAA's deputy chief operating officer testified."