What time on 9 11 did the stop all planes from flying?

On September 11, 2001, the Federal Aviation Administration (FAA) ordered a nationwide ground stop for all commercial air traffic at 9:45 AM Eastern Daylight Time (EDT). This decision came in response to the terrorist attacks that had begun earlier that morning, including the hijacking of four planes. The ground stop was a critical measure to prevent further attacks and ensure the safety of air travel.