A topA/C -- AircraftA/G -- Air to GroundA/H -- Altitude/HeightAAC -- Mike Monroney Aeronautical CenterAAF -- Army Air FieldAAI -- Arrival Aircraft IntervalAAP -- Advanced Automation ProgramAAR -- Airport Acceptance RateABDIS -- Automated Data Interchange System Service BACAIS -- Air Carrier Activity Information SystemACAS -- Aircraft Collision Avoidance SystemACC -- Airports Consultants CouncilACC -- Area Control CenterACCT -- Accounting RecordsACD -- Automatic Call DistributorACDO -- Air Carrier District OfficeACF -- Area Control FacilityACFO -- Aircraft Certification Field OfficeACFT -- AircraftACI-NA -- Airports Council International - North AmericaACID -- Aircraft IdentificationACIP -- Airport Capital Improvement PlanACLS -- Automatic Carrier Landing SystemACLT -- Actual Landing Time CalculatedACO -- Office of Airports Compliance and Field OperationsACO -- Aircraft Certification OfficeACRP -- Airport Cooperative Research ProgramADA -- Air Defense AreaADAP -- Airport Development Aid ProgramADAS -- AWOS Data Acquisition SystemADCCP -- Advanced Data Communications Control ProcedureADDA -- Administrative DataADF -- Automatic Direction FindingADI -- Automatic De-Ice and InhibitorADIN -- AUTODIN ServiceADIZ -- Air Defense Identification ZoneADL -- Aeronautical Data-LinkADLY -- Arrival DelayADO -- Airline Dispatch OfficeADP -- Automated Data ProcessingADS -- Automatic Dependent SurveillanceADSIM -- Airfield Delay Simulation ModelADSY -- Administrative Equipment SystemsADTN -- Administrative Data Transmission NetworkADTN2000 -- Administrative Data Transmission Network 2000ADVO -- Administrative VoiceAEG -- Aircraft Evaluation GroupAERA -- Automated En-Route Air Traffic ControlAEX -- Automated ExecutionAF -- Airway FacilitiesAFB -- Air Force BaseAFIS -- Automated Flight Inspection SystemAFP -- Area Flight PlanAFRES -- Air Force Reserve StationAFS -- Airways Facilities SectorAFSFO -- AFS Field OfficeAFSFU -- AFS Field UnitAFSOU -- AFS Field Office Unit (Standard is AFSFOU)AFSS -- Automated Flight Service StationAFTN -- Automated Fixed Telecommunications NetworkAGIS -- Airports Geographic Information System AGL -- Above Ground LevelAID -- Airport Information DeskAIG -- Airbus Industries GroupAIM -- Airman's Information ManualAIP -- Airport Improvement PlanAIRMET -- Airmen's Meteorological InformationAIRNET -- Airport Network Simulation ModelAIS -- Aeronautical Information ServiceAIT -- Automated Information TransferALP -- Airport Layout PlanALS -- Approach Lighting SystemALSF1 -- ALS with Sequenced Flashers IALSF2 -- ALS with Sequenced Flashers IIALSIP -- Approach Lighting System Improvement PlanALTRV -- Altitude ReservationAMASS -- Airport Movement Area Safety SystemAMCC -- ACF/ARTCC Maintenance Control CenterAMOS -- Automated Meteorological Observation StationAMP -- ARINC Message Processor (OR) Airport Master PlanAMVER -- Automated Mutual Assistance Vessel Rescue SystemANC -- Alternate Network ConnectivityANCA -- Airport Noise and Capacity ActANG -- Air National GuardANGB -- Air National Guard BaseANMS -- Automated Network Monitoring SystemANSI -- American National Standards GroupAOA -- Air Operations AreaAP -- Acquisition PlanAPP -- ApproachAPS -- Airport Planning StandardAQAFO -- Aeronautical Quality Assurance Field OfficeARAC -- Army Radar Approach Control (AAF)ARAC -- Aviation Rulemaking Advisory CommitteeARCTR -- FAA Aeronautical Center or AcademyARF -- Airport Reservation FunctionARFF -- Aircraft Rescue and Fire FightingARINC -- Aeronautical Radio, Inc.ARLNO -- Airline OfficeARO -- Airport Reservation OfficeARP -- Airport Reference PointARRA -- American Recovery and Reinvestment Act of 2009ARSA -- Airport Service Radar AreaARSR -- Air Route Surveillance RadarARTCC -- Air Route Traffic Control CenterARTS -- Automated Radar Terminal SystemASAS -- Aviation Safety Analysis SystemASC -- AUTODIN Switching CenterASCP -- Aviation System Capacity PlanASD -- Aircraft Situation DisplayASDA -- Accelerate -- Stop Distance AvailableASLAR -- Aircraft Surge Launch And RecoveryASM -- Available Seat MileASP -- Arrival Sequencing ProgramASOS -- Automatic Surface Observation SystemASQP -- Airline Service Quality PerformanceASR -- Airport Surveillance RadarASTA -- Airport Surface Traffic AutomationASV -- Airline Schedule VendorAT -- Air TrafficATA -- Air Transport Association of AmericaATAS -- Airspace and Traffic Advisory ServiceATCAA -- Air Traffic Control Assigned AirspaceAT&T -- American Telephone and TelegraphAT&T ASDC -- AT&T Agency Service Delivery CenterAT&T CSA -- AT&T Customer Support AssociateATC -- Air Traffic ControlATCBI -- Air Traffic Control Beacon IndicatorATCCC -- Air Traffic Control Command CenterATCO -- Air Taxi Commercial OperatorATCRB -- Air Traffic Control Radar BeaconATCRBS -- Air Traffic Control Radar Beacon SystemATCSCC -- Air Traffic Control Systems Command CenterATCT -- Airport Traffic Control TowerATIS -- Automated Terminal Information ServiceATISR -- ATIS RecorderATM -- Air Traffic 。