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GAO discussed the Federal Aviation Administration's (FAA) Wide Area Augmentation System (WAAS) program, focusing on: (1) the likelihood of WAAS satisfying key performance requirements within current program cost and schedule estimates; (2) the importance of avoiding delays in FAA's timetable for shutting down (decommissioning) ground-based navigation aids; and (3) the potential impact of cost increases and decommissioning delays on the benefit-cost analysis for the WAAS program.

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