. . . . . . "Air traffic control advanced automation system still vulnerable to cost and schedule problems : report to the Chair, Activities and Transportation Subcommittee, Committee on Government Operations, House of Representatives"@en . . . . . . "Air traffic control : advanced automation system still vulnerable to cost and schedule problems : report to the Chair, Activities and Transportation Subcommittee, Committee on Government Operations, House of Representatives"@en . . . . . .