The Federal Aviation Administration on Friday released a list of 149 non-fed staffed air traffic control towers that it will close due to budget cuts stemming from sequestration.
The 149 air traffic facilities slated to begin closing on April 7 are all staffed by contract employees who are not FAA employees. There were 65 other facilities staffed by FAA employees on the preliminary list of towers that could be closed.
A final decision on their closure will require further review, the FAA said.
The FAA says it must trim $637 million for the rest of the fiscal year that ends Sept. 30. The agency said it had no choice but to subject most of its 47,000 employees, including tower controllers, to periodic furloughs and to close air traffic facilities at small airports with lighter traffic.
The airports targeted for tower shutdowns have fewer than 150,000 total flight operations per year. Of those, fewer than 10,000 are commercial flights by passenger airlines.
The closures will not force any of those airports to shut down, but pilots will be left to coordinate takeoffs and landings among themselves over a shared radio frequency with no help from ground controllers.
Those procedures are familiar to all pilots.
Since a preliminary list of facilities was released a month ago, the FAA plan has raised wide-ranging concerns, including worries about the effect on safety and the potential financial consequences for communities that rely on airports to help attract businesses and tourists.
"We will work with the airports and the operators to ensure the procedures are in place to maintain the high level of safety at non-towered airports," FAA Administrator Michael Huerta said in a statement.
Airlines have yet to say whether they will continue offering service to airports that lose tower staff. The trade group Airlines for America said its member carriers have no plans to cancel or suspend flights as a result of the closures.
Airport directors, pilots, and others in the aviation sector have argued that stripping away an extra layer of safety during the most critical stages of flight will elevate risks and at the very least slow years of progress that made the U.S. aviation network the safest in the world.
Opponents of the closures are also warning of possible disruptions to medical transport flights and flight schools training the next generation of pilots.
Still, hundreds of small airports around the country routinely operate without controllers. Pilots flying there are trained to watch for other aircraft and announce their position over the radio during approaches, landings and takeoffs.
The agency is also still considering eliminating overnight shifts at 72 additional air traffic facilities, including some at major airports like Chicago's Midway International and General Mitchell Airport in Milwaukee. There was no word Friday on when that decision will come.
Some aviation experts say overnight shifts should have been eliminated regardless of the sequester at facilities that don't see enough traffic to justify the expense. The budget cuts being forced on the FAA could provide the agency with political cover to make some of those changes.
Here's a complete list of the 149 control towers the FAA plans to shutter:
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The Associated Press contributed to this report.