IAS
Indicated Air SpeedIFF
Identification Friend or FoeIFR
Instrument Flight Rules, flying purely by reference to instruments.ILS
Instrument Landing SystemINS
Inertial Navigation System.An onboar'd system which uses gyroscopes, (either mechanical or laser) to sense acceleration and deceleration and compute current position.The system needs a known starting point to be entered prior to flight.
IP
Initial Point
The location chosen to set up an attack run on a ground targetIR
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