ACC Area Control Center
AFTN Aeronautical Fixed Telecommunication Network
AIDC Air Traffic Services Inter Facility Communication
AIRMET Information Concerning En-Route Affect the Safety of Aircraft Operations
AMHS ATS Message Handling System
AMSS Aeronautical Mobile Satellite Service
ANC Air Navigation Commission
ARR Arrival
ATC Air Traffic Control
ATM Air Traffic Management
ATN Aeronautical Telecommunication Network
ATS Air Traffic Services
AU Access Unit
CAA Civil Aviation Authority
CDN Co-Ordination
CHG Change
CIDIN Common ICAO Data Interchange Network
CLNS Connectionless Network Service
CNL Cancel
CNS Communication, Navigation and Surveillance
CNS/ATM Communications, Navigation, Surveillance/Air Traffic Management
CONS Connection-Oriented Network Service
COTS Commercial off The Shelf – Software Products Developed for General Purpose Usage As Opposed To Bespoke Software
CPDLC Controller-Pilot Data Link Communication
CPL Current Flight Plan
DEP Depart or Departure
DEST Destination
DIR Directory Services
DLA Delay
DOC Document (ICAO)
EMERG Emergency
ETA Estimated Time of Arrival Or
FIC Flight Information Center
FP Flight Plan
HF High Frequency
ICAO International Civil Aviation Organization
ICS Internet Communications Services
IETF Internet Engineering Task Force
IMAP Internet Message Access Protocol
IP Internet Protocol
ITU International Telecommunication Union
LLC Logic Link Control
MAC Medium Access Control
ME Message Store
METAR Aviation Routine Weather Report
MHS Message Handling System
MMHS Military Message Handling System
MS Message Store
MTA Message Transfer Agent
OPMET Operational Meteorological
OSI Open Systems Interconnect
OWA Outlook Web Access
POP3 Post Office Protocol Version 3
RCAG Remote Communication Air-Ground
SARPS Standards And Recommended Practices-ICAO
SEL Security
SMTP Simple Mail Transfer Protocol
SPECI Aviation Selected Special Weather Report
SSR Secondary Surveillance Radar
TAFOR Terminal Area Forecast
TCO Total Cost of Ownership
TCP Transmission Control Protocol
TWR Aerodrome Control Tower
UA User Agent
ULCS Upper Layer Communications Service
UTC Co-Ordination Universal Time
VHF Very High Frequency