In the latest incident, the controller was watching a movie on a DVD player early Sunday morning while on duty at a regional radar center in Oberlin, Ohio, near Cleveland that handles high-altitude air traffic, the FAA said in a statement Monday.
The controller's microphone was inadvertently activated, transmitting the audio of the movie - the 2007 crime thriller "Cleaner," starring Samuel L. Jackson - for more than three minutes to all the planes in the airspace that the controller was supposed to be monitoring, the agency said.
The controller's microphone became stuck in the transmit position, preventing him from hearing incoming radio calls or issuing instructions to planes during the incident, the agency said.
The controller was alerted to the mishap when he was contacted by a military pilot.
Besides the controller, the FAA also has suspended a manager at the Oberlin center.
In all, the FAA has suspended nine controllers and supervisors since late March.
In five of the cases the controllers allegedly fell asleep. In another case, the FAA is investigating why two controllers in Lubbock, Texas, were unresponsive to radio calls.
Nearly all the incidents occurred during overnight shifts when traffic is light and people naturally have trouble staying awake.
The incidents have shaken FAA officials, made air traffic controllers the butt of late-night comedians and raised public jitters about the safety of air travel.
FAA Administrator Randy Babbitt said early Monday, before the agency had disclosed the incident near Cleveland, that he was "infuriated" that air traffic controllers have been caught snoozing on the job.
"None of us in this business can ... tolerate any of this," Babbitt said. "It absolutely has to stop."
Babbitt was at a regional radar center near Atlanta with Paul Rinaldi, president of the National Air Traffic Controllers Association, the union that represents controllers. The pair met with about 50 controllers and other FAA employees as they kicked off a nationwide tour of air traffic facilities aimed at sending a message as much to the public as to controllers that unprofessional behavior won't be tolerated.
Transportation Secretary Ray LaHood underscored the same message in a series of television interviews over the past several days. Even President Barack Obama joined the chorus, telling ABC News last week, "We've got it under control."
But every time administration officials say they've moved decisively to contain the problem, another controller steps over the line.
The day before the Cleveland incident a controller fell asleep while working an overnight shift at busy regional radar facility in Miami that handles high-altitude traffic for Florida, parts of the Atlantic Ocean and the Caribbean.
The incidents have raised concerns about work schedules that don't allow controllers realistic opportunities for sleep.
The FAA forbids controllers from sleeping on the job, even during the 20-minute to 30-minute breaks they receive every few hours. Babbitt stood by that position Monday.
Instead, the agency said it will require controllers to have an extra hour off between shifts - a minimum of nine hours instead of eight - to get more sleep.
Babbitt said at the meeting that the scandal caused by sleeping controllers has harmed the agency's credibility. He said passengers should never have to worry about whether a flight crew is rested, a plane is properly maintained or air traffic controllers are on the job.
"That should never be a thought for anybody getting in an airplane in this country," he said. "And it hasn't been a thought. But unfortunately, we have raised that concern."
Henry reported from Peachtree City, Ga.