Ian Duncan

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.

Investigators concluded that the pilot passed out after the plane lost cabin pressure, and that the lack of extra oxygen contributed to the crash.

Moving air traffic controllers means retraining them on the quirks of a new facility, and the process can take years.

President Donald Trump’s own policies have prompted departures of key staff and hurt morale at the aviation agency, complicating multi-billion dollar modernization plans.

A Virginia-based helicopter unit will pause flights pending the outcome of an internal inquiry, an Army spokeswoman said.

The Federal Aviation Administration is also adding staff members at National Airport, where a supervisor is accused of punching an air traffic controller in the face.

Officials at a truck safety agency have amassed a backlog of cases as they carry out legal reviews in response to directions from the Trump administration.

The Delta pilot said there was an aircraft 500 feet below the passenger jet after it took off from Reagan National Airport.

Investigators have found that the Federal Aviation Administration had data showing the risk of a crash before the midair collision at Reagan National Airport.

Cars without a driver behind the wheel aren’t legal in D.C. Waymo hopes the city will change the laws to allow its autonomous vehicles on city streets.