SUMMARY
- DC ground stop halted departures to Reagan National, Dulles and BWI after odor reported at Potomac TRACON.
- Flight delays quickly exceeded 90 minutes during one of the busiest weekly travel periods.
- FAA investigation continues as officials assess safety of Washington airspace operations.
A chemical odor detected Friday evening at a federal air traffic control facility in Warrenton, Virginia triggered a DC ground stop that halted departures to three major airports serving the Washington region, leaving passengers facing delays exceeding 90 minutes while authorities investigated the source of the smell.
The disruption underscored how dependent the capital region is on the Potomac TRACON radar facility, which manages complex Washington airspace used by commercial, military and government aircraft every day.
According to the Federal Aviation Administration the odor forced controllers at the Warrenton site to implement a DC ground stop for arriving traffic at Ronald Reagan Washington National Airport, Washington Dulles International Airport and Baltimore/Washington International Thurgood Marshall Airport.
The Potomac Terminal Radar Approach Control facility coordinates arrivals and departures for dozens of airports across Virginia Maryland and the broader mid Atlantic corridor including Richmond and Joint Base Andrews.
US Transportation Secretary Sean Duffy said the FAA investigation was working to identify the cause of the odor and restore normal traffic flows safely.
Michael McCormick professor of air traffic management at Embry‑Riddle Aeronautical University said shutting down a control facility can quickly cascade into a regional DC ground stop because aircraft must be spaced farther apart in restricted airspace.
Passengers waiting at Reagan National described crowded gate areas and limited updates as the DC ground stop stretched into the evening travel rush.
Laura Jenkins, a traveler heading to Atlanta, said airline staff told passengers to monitor mobile apps for updates.
FAA officials said the DC ground stop would remain in place until controllers confirmed the Warrenton facility was safe and traffic levels across Washington airspace could be managed without risk.
The incident highlights the vulnerability of highly centralized air traffic systems where a single operational disruption can affect millions of travelers across the eastern United States officials.
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