CHICAGO – Under orders to trim hundreds of millions of dollars from its budget, the Federal Aviation Administration released a final list Friday of 149 air traffic control towers that it will close at small airports around the country starting early next month.

The closures will not force the shutdown of any of those airports, but pilots will be left to coordinate takeoffs and landings among themselves over a shared radio frequency with no help from ground controllers. All pilots are trained to fly using those procedures.

The plan has raised concerns since a preliminary list of facilities was released a month ago. Those worries include the impact on safety and the potential financial effect on communities that rely on airports to help attract businesses and tourists.