| 14 CFR | Title 14 of the Code of Federal Regulations |
| 91K | Part 91 Subpart K (14 CFR) |
| A RNP | Advanced Required Navigation Performance |
| AC | Advisory Circular |
| ACARS | Aircraft Communications Addressing and Reporting System |
| ADS-B | Automatic Dependent Surveillance – Broadcast |
| ADS-C | Automatic Dependent Surveillance – Contract |
| AEG | Aircraft Evaluation Group |
| AFCS | Automatic Flight Control System |
| AFM | Airplane Flight Manual |
| AFMS | Airplane Flight Manual Supplement |
| AFN | ATS Facilities Notification |
| AFTN | Aeronautical Fixed Telecommunication Network |
| AGL | Above Ground Level |
| AIP | Aeronautical Information Publication |
| AIR | Aircraft Certification Service |
| ALTRV | Altitude Reservation |
| AMC | Acceptable Means of Compliance |
| ANP | Actual Navigation Performance |
| ANSP | Air Navigation Service Provider |
| AOA | Airport Operations Area |
| AOC | Airline Operational Control |
| APIS | Advance Passenger Information System |
| ASEPS | Advanced Surveillance-Enhanced Procedural Separation |
| ATC | Air Traffic Control |
| ATM | Air Traffic Management |
| ATN | Aeronautical Telecommunications Network |
| ATN B1 | Aeronautical Telecommunications Network Baseline 1 |
| ATS | Air Traffic Service |
| ATSU | Air Traffic Service Unit |
| BOTA | Brest Oceanic Transition Area |
| CF | Coastal Fix |
| CFR | Combined Federal Regulation |
| CHDO | Certificate Holding District Office |
| CMO | Certificate Management Office |
| CNS | Communication, Navigation, and Surveillance |
| CPDLC | Controller Pilot Data Link Communications |
| CSP | Communication Service Provider |
| CTA | Control Area |
| CTA/FIR | Control Area/Flight Information Region |
| CVR | Cockpit Voice Recorder |
| DCL | Departure Clearance |
| DCPC | Direct Controller Pilot Communications |
| DHS | Department of Homeland Security |
| DLS IR | Data Link Services Implementing Rule |
| DME | Distance Measuring Equipment |
| DP | Departure Procedure |
| DSP | Data Link Service Providers |
| DTK | Desired Track |
| FAA | Federal Aviation Administration |
| FANS | Future Air Navigation System |
| FDE | Fault Detection and Exclusion |
| FDR | Flight Data Recorder |
| FGS | Flight Guidance System |
| FIR | Flight Information Region |
| FL | Flight Level |
| FMC | Flight Management Computer |
| FMS | Flight Management System |
| FRT | Fixed Radius Transition |
| FS | Flight Standards Service |
| FSDO | Flight Standards District Office |
| GNSS | Global Navigation Satellite System |
| GPS | Global Positioning System |
| HF | High Frequency |
| HFDL | High Frequency Data Link |
| HLA | High Level Airspace |
| ICAO | International Civil Aviation Organization |
| INF | Inland Navigation Fix |
| INS | Inertial Navigation System |
| IRS | Inertial Reference System |
| IRU | Inertial Reference Unit |
| ITP | In Trail Procedure |
| KCM | Known Crew Member |
| LEO | Law Enforcement Officer (civilian) |
| LNAV | Lateral Navigation |
| LOA | Letter of Authorization |
| LRN | Long Range Navigation |
| LRNS | Long Range Navigation System |
| M-LRNS | Multiple Long-Range Navigation Systems |
| MASPS | Minimum Aircraft System Performance Specifications |
| MEL | Minimum Equipment List |
| MNPS | Minimum Navigation Performance Specification |
| MNT | Mach Number Technique |
| MSpec | Management Specification |
| NAR | North American Route |
| NAT | North Atlantic |
| NAT | North Atlantic Track |
| Nav Spec | Navigation Specification |
| NM | Nautical Mile |
| NOTA | Northern Oceanic Transition Area |
| NOTAM | Notice to Airmen |
| NOV | Notice of Violation |
| NSE | Navigation System Error |
| OAC | Oceanic Area Control Center |
| OCA | Oceanic Control Area |
| OEM | Original Equipment Manufacturer |
| OpSpec | Operation Specification |
| OTS | Organized Track System |
| PANS-ABC | Procedures for Air Navigation Services – Abbreviations and Codes |
| PANS-AD | Procedures for Air Navigation Services – Aerodrome |
| PANS-AIM | Procedures for Air Navigation Services – Aeronautical Information Management |
| PANS-ATM | Procedures for Air Navigation Services – Air Traffic Management |
| PANS-OPS | Procedures for Air Navigation Services – Aircraft Operations |
| PANS-TRG | Procedures for Air Navigation Services – Training |
| PBN | Performance Based Navigation |
| PF | Pilot Flying |
| PI | Principal Inspector |
| PM | Pilot Monitoring |
| POH | Pilot’s Operating Handbook |
| POI | Principal Operations Inspector |
| PRM | Preferred Route Message |
| R/T | Radio Telephony |
| RA | Resolution Advisory |
| RADAR | Radio Detection and Ranging |
| RAIM | Receiver Autonomous Integrity Monitoring |
| RCP | Required Communication Performance |
| RLatSM | Reduced Lateral Separation Minimum |
| RLongSM | Reduced Longitudinal Separation Minimum |
| RNAV | Area Navigation |
| RNP | Required Navigation Performance |
| RSP | Required Surveillance Performance |
| RVSM | Reduced Vertical Separation Minima |
| S-LRNS | Single Long-Rage Navigation System |
| SAO | Special Areas of Operation |
| SATCOM | Satellite Communications |
| SB | Service Bulletin |
| SBAS | Satellite Based Augmentation System |
| SELCAL | Selective Calling |
| SES | Single European Skies |
| SIDA | Security Identification Display Area |
| SIS | Signal in Space |
| SLOP | Strategic Lateral Offset Procedure |
| SOC | Statement of Compliance |
| SOTA | Shannon Oceanic Transition Area |
| SSR | Secondary Surveillance RADAR |
| STC | Supplemental Type Certificate |
| STC | Supplemental Type Certificate |
| TA | Traffic Advisory |
| TC | Type Certificate |
| TMI | Track Message Identification |
| TOAC | Time of Arrival Control |
| TSA | Transportation Security Administration |
| TSE | Total System Error |
| TSO | Technical Standard Order |
| UTC | Coordinated Universal Time |
| VDL | VHF Datalink |
| VDL-A | VHF Data Link |
| VDLM2 | VHF Data Link Mode 2 |
| VDR | VHF Data Radio |
| VHF | Very High Frequency |
| WAH | When Able Higher |
| WATRS | West Atlantic Route System |
| WGS | World Geodetic System |
| WPR | Waypoint Position Report |
| Z | Zulu |
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