The incident occurred Tuesday afternoon when air traffic controllers were making adjustments for landing and departing aircraft because of bad weather.
"During the switchover of operations, miscommunication between the Tracon and the DCA tower led to a loss of the required separation between two regional jets departing from Runway 1 and a regional jet inbound for Runway 19," the FAA said.
"Tracon," or terminal radar approach control, is a reference to a regional radar facility. "DCA" is the International Air Transport Association code for Reagan National Airport.
The agency is investigating and plans to take "appropriate action to address the miscommunication."
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