FAA announced the firings in a statement late Wednesday and said it fired controllers in both Miami and Knoxville, Tennessee.
The controller in Miami was found sleeping Saturday at a regional radar facility that handles high altitude air traffic for portions of Florida, the Atlantic Ocean and the Caribbean Sea. A preliminary review of air traffic tapes indicated he did not miss any calls from aircraft and there was no impact on flight operations.
The Knoxville incident occurred on Feb. 19 at a radar facility at the McGhee Tyson Airport. Officials said the controller deliberately slept for about five hours despite attempts by a co-worker to wake him.
There have been nine suspensions of controllers and managers in recent weeks with several related to sleeping incidents.
The Associated Press contributed to this story