- IACA
International Air Carrier Association
- IAF
Initial approach fix
- IAP
Instrument approach procedure
- IAPA
International Airline Passengers Association
- IAS
Indicated airspeed
- IAS
Indicated Airspeed
- IATA
International Air Transport Association
- IATA
International Air Transport Association
- IATAN
International Airlines Travel Agent Network (wholly owned subsidiary of IATA)
- IATF
International Airline Training Fund
- ICAO
International Civil Aviation Organization
- ICAO
International Civil Aviation Organisation
- ICCS
IATA Currency Clearance Service
- ICH
IATA Clearing House
- ICO
Idle cut-off
- ID
Identify/Identification or identifier
- IDENT
Identify/Identifier
- IDS
Information Display System or Integrated Display System
- IF
Intermediate Approach Fix
- IFALPA
International Federation of Airline Pilots Associations
- IFATCA
International Federation of Air Traffic Controllers' Associations
- IFATCA
International Federation of Air Traffic Controllers' Associations
- IFE
In-Flight Entertainment
- IFR
Instrument Flight Regulations
- IFR
Instrument Flight Rules
- IFSP
In-flight security personnel
- ILS
Instrument Landing System
- ILS
Instrument Landing System
- ILS
Instrument Landing System
- IMC
Instrument Meteorological Conditions
- IMC
Instrument Meteorological Conditions
- IND
Indicator[disambiguation needed]
- INS
Inertial Navigation System
- INS
Inertial Navigation Syste
- IOSA
IATA Operational Safety Audit
- IRS
Inertial Reference System
- ISA
International Standard Atmosphere
- ISA
International Standard Atmosphere
- ISIS
Integrated Standby Instrument System
- ISO
International Standards Organisation
- ISP
Integrated Switching Panel
- ITF
International Transport Workers Federation
- ITT
Interstage Turbine Temperature
- ITU
International Telecommunication Union
- IVSI
Instantaneous Vertical Speed Indicator
- InHg
Inch of Mercury
