Chemical Smell at Control Center Halts Traffic at Washington and Baltimore Airports

The ground delays, which also affected the airport serving Richmond, Va., were expected to last until at least midnight, according to the F.A.A., which said the smell had affected air traffic controllers.​The ground delays, which also affected the airport serving Richmond, Va., were expected to last until at least midnight, according to the F.A.A., which said the smell had affected air traffic controllers.