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A&E: Architectural and Engineering (FAA20)

A.M. Peak Period: The period in the morning when additional services are provided to handle higher passenger volumes. The period begins when normal, scheduled headways are reduced and ends when headways return to normal. (FTA1)

A/C: Aircraft (FAA8)

A/DACG: Arrival / Departure Airfield Control Group (MTMC1)

A/G: Air to Ground (FAA20)

A/H: Altitude/Height (FAA20)

A/I: Accident/Incident (FRA4)

A3: Automatic Three Speed (DOE6)

A4: Automatic Four Speed (DOE6)

A5: Automatic Five Speed (DOE6)

AA: Associate Administrator (FHWA18)

AA: Alternatives Analysis (FTA5)

AAA: Automated Airlift Analysis (MTMC1)

AAA: Appraisers Association of America (FHWA18)

AAA: American Automobile Association (FHWA11)

AAA: Airport Airspace Analysis (FAA20)

AAC: Advanced AERA Concepts (FAA17)

AAC: Mike Monroney Aeronautical Center (FAA7)

AACE: Association for the Advancement of Cost Engineering International (FTA5)

AACN: Advanced Automatic Crash Notification (NHTSA7)

AADC: Airport Average Daily Capacity (FAA20)

AADC: Approach and Departure Control (FAA16)

AADL: Annual Average Daily Loading (FHWA19)

AADT: Annual Average Daily Traffic (BTS11)

AADTT: Average Annual Daily Truck Traffic (FHWA21)

AADW: Annual Average Days of the Week (FHWA19)

AAF: Army Airfield (FAA17)

AAF: Airway Facilities Service (FAA20)

AAF: Army Air Field (FAA20)

AAF-1: Director of Airway Facilities (FAA20)

AAI: Arrival Aircraft Interval (FAA20)

AAI: FAA Office of Accident Investigation (FAA20)

AAIA: Airport and Airway Improvement Act (OST3)

AAL: American Airlines (FAA18)

AAL: Alaska Region (FAA20)

AALPS: Automated Air Load Planning System (MTMC1)

AAM: Office of Aerospace Medicine (FAA20)

AAMA: American Automobile Manufacturers Association (BTS11)

AAMS: Aircraft Arrival Management System (FAA20)

AAMVA: American Association of Motor Vehicle Administrators (FHWA10) (NHTSA6)

AAN: Air Ambulance Network (MTMC1)

AAP: Advanced Automation (FAA17)

AAP: Advanced Automation Program (FAA20)

AAPA: American Association of Port Authorities (FMCSA2)

AAR: Airport Acceptance Rate (FAA4) (FAA8)

AAR: Airport and Aircraft Safety Research and Development (FAA20)

AAR: Airport Acceptance Rate (FAA20)

AAR: After Action Review (FAA20)

AAR: Association of American Railroads (BTS11)

AARP: American Association of Retired Persons (FHWA18)

AAS: Advanced Automation System (FAA20)

AAS: Airport Advisory Service (FAA2)

AAS: Advanced Automation System (FAA17) (FAA7) (FAA8)

AAS: Air Activity Statistics of Certificated Air Carriers (BTS11)

AASHO: American Association of State Highway Officials (FHWA17)

AASHTO: American Association of State Highway and Transportation Officials (FHWA18)

AASR: Aging Aircraft Safety Rule (FAA20)

AAST: Atlanta Administrative Services Team (FHWA18)

AAT: Associate Administrator for Air Traffic (FAA20)

AATF: Airport and Airway Trust Fund (DOT1)

AAWDT: Annual Average Weekday Traffic (FHWA19)

ABA: American Bus Association (ENO1)

ABA: FAA Office of Financial Services (FAA20)

ABA: Office of Budget (FAA20)

ABA: American Bus Association (FHWA18)

Abaft: A point beyond the midpoint of a ship's length. (MARAD2)

Abandoned Runway: Intact but not maintained or intended for use runway. (DOI3)

Abbreviated Injury Scale: An integer scale developed by the Association for the Advancement of Automotive Medicine to rate the severity of individual injuries. (NHTSA2)

Abbreviated Instrument Flight Rules Flight Plans: An authorization by Air Traffic Control (ATC) requiring pilots to submit only that information needed for the purpose of ATC. It includes only a small portion of the usual Instrument Flight Rules (IFR) flight plan information. In certain instances, this may be only aircraft identification, location, and pilot request. Other information may be requested if needed by ATC for separation/control purposes. It is frequently used by aircraft which are airborne and desire an instrument approach or by aircraft which are on the ground and desire a climb to Visual Flight Rule (VFR)-on-top. (FAA4)

ABC: American Building Contractors (FHWA20)

ABC: Alcohol Beverage Control (NHTSA7)

ABDIS: Automated Data Interchange System Service B (FAA20)

Abeam: An aircraft is "abeam" a fix, point, or object when that fix, point, or object is approximately 90 degrees to the right or left of the aircraft track. Abeam indicates a general position rather than a precise point. (FAA4)

Abort: To terminate a preplanned aircraft maneuver; (e.g., an aborted takeoff). (FAA4)

ABQ: Albuquerque International Airport (FAA11)

ABS: Automatic Block Signals (FRA5)

ABS: American Bureau of Shipping (MARAD4)

ABS: Antilock Braking System (NHTSA5)

ABS: Automatic Block Signal (TRB1)

Absolute Block: A block in which no train is permitted to enter while it is occupied by another train. (49CFR218)

ABYC: American Boat and Yacht Council (USCG1)

AC: Airframe Change (MTMC1)

AC: Aircraft Commander (MTMC1)

AC: Aircraft (MTMC1)

AC: Air Controller (MTMC1)

AC: Asphalt Concrete (FHWA19)

AC: Advisory Circular (FAA19) (FAA12)

AC: Alternating Current (BTS10)

AC: Alcohol Concentration (49CFR383)

ACAA: Air Carrier Association of America (FAA20)

ACAIS: Air Carrier Activity Information System (BTS7) (FAA11)

ACARS: Automatic Communications Addressing and Reporting System (FAA17)

ACAS: Airborne Collision Avoidance System (FAA7)

ACAS: Aircraft Collision Avoidance System (FAA20)

ACC: Airports Consultants Council (FAA20)

ACC: Area Control Center (FAA20)

ACC: Air Center Commander (MTMC1)

ACC: Aircraft Commander (MTMC1)

ACC: Adaptive Cruise Control (NHTSA7)

ACC/INC: Accident/Incident (FRA4)

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