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gao, governmentaccountabilityoffice, usgovernmentaccountabilityoffice, usgao, unitedstatesgovernmentaccountabilityoffice, government, congress, watchdog, oversight, governmentwatchdog, gao15608, nextgenerationairtransportationsystem, adsb, automaticdependentsurveillancebroadcast, ansp, airnavigationserviceprovider, atm, airtrafficmanagement, atn, aeronauticaltelecommunicationsnetwork, blockupgrades, aviationsystemblockupgrades, caas, civilaviationauthorityofsingapore, canso, civilairnavigationservicesorganization, carats, collaborativeactionsforrenovationofairtrafficcontrolsystem, easa, europeanaviationsafetyagency, eram, enrouteautomationmodernization, eu, europeanunion, eurocae, europeanorganizationforcivilaviationequipment, faa, federalaviationadministration, fans, futureairnavigationsystem, fians, futureindiaairnavigationsystems, ganp, globalairnavigationplan, gps, globalpositioningsystem, icao, internationalcivilaviationorganization, moc, memorandumofcooperation, nextgen, nrc, nationalresearchcouncil, rtca, radiotechnicalcommissionforaeronautics, sesar, singleeuropeanskyairtransportationmanagementresearch, sirus, sirusproject, sju, sesarjointundertaking, swim, systemwideinformationmanagement, waas, wideareaaugmentationsystem, australia, canada, china, russia
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