Air traffic control :
voice communications system challenges continue.
Washington, D.C. : United States General Accounting Office, 
United States. /
Federal Aviation Administration.
Air traffic control > Air traffic control / Automation.
Air transportation > Air transportation / Safety.
Air traffic control > Air traffic control / United States > Air traffic control / United States / Automation.
"Report to the Chairman, Subcommittee on Transportation and Related Agencies, Committee on Appropriations, U.S. Senate."
Running title: FAA voice communications system.
13 p. ;
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