A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

IACInstrument approach chart (followed by name/title)
IAFInitial approach fix
IAOIn and out of clouds
IAPInstrument approach procedure
IARIntersection of air routes
IASIndicated air speed
IATAInternational Air Transport Association
IBNIdentification beacon
ICIce crystals (very small ice crystals in suspension, also known as diamond dust)
ICAOInternational Civil Aviation Organization
ICEIcing
IDIdentifier or identify
IDENTIdentification
IFIntermediate approach fix
IFPSInitial Flight Plan Processing System
IFRInstrument flight rules
IGAInternational general aviation
ILSInstrument landing system
IMInner marker
IMCInstrument meteorological conditions
IMGImmigration
IMPRImprove or improving
IMTImmediate or immediately
INAInitial approach
INBDInbound
INCIn cloud
INCERFAUncertainty phase
INFOInformation
INOPInoperative
INPIf not possible
INPRIn progress
INSInertial navigation system
INSTLInstall or installed or installation
INSTRInstrument
INTIntersection
INTLInternational
INTRGInterrogator
INTRPInterrupt or interruption or interrupted
INTSFIntensify or intensifying
INTSTIntensity
IRIce on runway
ISAInternational standard atmosphere
ISOInternational organisation for standartisation
ISOLIsolated
(C) 2012-18 Jan Hrkal