| 'I' |
See inphase |
| IA |
Iowa |
| IAO |
In and out of clouds |
| IC |
Ice Crystals, Diamond dust (very small ice crystals in suspension), or In-Cloud Lightning |
| ICAO |
International Civil Aviation Organization |
| ICE |
Icing |
| ICG |
Icing |
| ICGIC |
Icing in clouds |
| ICGIP |
Icing in precipitation |
| ID |
Identifier, identify, or Idaho |
| IFFDP |
International Flight Folder Documentation Program |
| IFLOWS |
The Integrated Flood Observing and Warning System |
| IFR |
Instrument Flight Rules |
| IL |
Illinois |
| IMC |
Instrument meteorological conditions |
| IMDT |
Immediate |
| IMDTLY |
Immediately |
| IMPL |
Impulse |
| IMPLS |
Impulses |
| IMPR |
Improve or improving |
| IMPT |
Important |
| IMT |
Immediate or immediately |
| INBD |
Inbound |
| INC |
In cloud |
| INCL |
Include |
| INCLD |
Included |
| INCLG |
Including |
| INCLS |
Includes |
| INCR |
Increase |
| INCRD |
Increased |
| INCRG |
Increasing |
| INCRGLY |
Increasingly |
| INCRS |
Increases |
| INDC |
Indicate |
| INDCD |
Indicated |
| INDCG |
Indicating |
| INDCS |
Indicates |
| INDEF |
Indefinite |
| INFO |
Information |
| INLD |
Inland |
| INOP |
Inoperative |
| INP |
If not possible |
| INPR |
In progress |
| INS |
Inertial Navigation System |
| INSTBY |
Instability |
| INSTF |
Intensify or intensifying |
| INSTL |
Install or installed or installation |
| INTCNTL |
Intercontinental |
| INTL |
International |
| INTMD |
Intermediate |
| INTMT |
Intermittent |
| INTMTLY |
Intermittently |
| INTR |
Interior |
| INTRMTRGN |
Intermountain region |
| INTRP |
Interupt or interruption or interrupted |
| INTS |
Intense |
| INTSFCN |
Intensification |
| INTSFY |
Intensify |
| INTSFYD |
Intensified |
| INTSFYG |
Intensifying |
| INTSFYS |
Intensifies |
| INTST |
Intensity |
| INTSTY |
Intensity |
| INTVL |
Interval |
| INU |
Inertial Navigation Unit |
| INVOF |
In vicinity of |
| INVRN |
Inversion |
| IOVC |
In overcast |
| IP |
Ice pellets |
| IPV |
Improve |
| IPVG |
Improving |
| IR |
Infrared or Ice on runway |
| ISA |
International standard atmosphere |
| ISOL |
Isolated or Isolate |
| ISOLD |
Isolated |
| ITCZ |
Intertropical Convergence Zone |
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