Key keywords: Ground stops DC airports, Ronald Reagan Washington National Airport, Dulles International Airport, Baltimore/Washington International Thurgood Marshall Airport, FAA airspace restrictions, NORAD DC security, US East Coast flight disruptions, DC metro area travel delays On the afternoon of October 16, 2024, the U.S. Federal Aviation Administration (FAA) issued a rare coordinated full ground stop for all three major airports serving the Washington D.C. metropolitan area, disrupting travel for an estimated 75,000 passengers across the country in a matter of hours. The three affected facilities – Ronald Reagan Washington National Airport (DCA), Dulles International Airport (IAD), and Baltimore/Washington International Thurgood Marshall Airport (BWI) – collectively handle over 115 million passenger enplanements annually, serving as core transit hubs for domestic travel on the U.S. East Coast and limited long-haul international routes to Europe, Central America, and Canada. A ground stop is a strict air traffic management measure that requires all departing flights bound for the affected airports to remain parked at their origin gates until the restriction is lifted, while incoming flights are either diverted to alternate airports or held in predetermined holding patterns at safe altitudes if they have sufficient fuel reserves. The FAA initially announced the measure with minimal public detail, only noting that it was working in close coordination with the North American Aerospace Defense Command (NORAD) on an ongoing airspace security assessment. Subsequent updates confirmed the stop was triggered by multiple credible reports of an unauthorized unmanned aerial vehicle (UAV) operating in restricted airspace within 3 nautical miles of the National Mall, a high-security zone that covers federal government buildings, monuments, and the White House complex. As of two hours after the initial ground stop was issued, flight tracking platform FlightAware recorded more than 1,300 delayed flights and 340 canceled flights across the three airports, with ripple effects reported as far as Los Angeles, Miami, and Vancouver. The restriction was lifted in phases starting 90 minutes after implementation, after NORAD confirmed the airspace was clear and no active security threat was present. FAA officials noted in a follow-up press briefing that the coordinated stop was a precautionary measure designed to prioritize passenger and public safety, and that the agency would conduct a full review of the incident to streamline verification processes for UAV reports and reduce unnecessary disruptions in future security events. Airlines operating across the three airports issued blanket travel waivers for all passengers traveling to or from the D.C. area on the day of the incident, allowing free rebooking or ticket refunds for affected travelers.