India, March 29 -- Airports serving Washington, D.C., Baltimore and some cities in Virginia briefly halted all flights Friday evening because of what federal authorities said was a strong chemical smell at the flight centre that controls traffic into the airports. According to a spokesperson with the Department of Transportation, the Federal Aviation Administration temporarily stopped traffic at Ronald Reagan Washington National Airport, Washington Dulles International Airport, Baltimore-Washington International Airport, Charlottesville-Albemarle Airport and Richmond International Airport because of a chemical odor at the Potomac TRACON. The TRACON is a terminal radar approach control facility that manages air traffic for those regions, a...