.
also called: airspeed

Fr: vitesse indiquée
indicated altitude The altitude as shown by an altimeter. On a pressure or barometric altimeter, it is altitude as shown uncorrected for instrument error and uncompensated for variation from standard atmospheric conditions.
. also called: altitude
Fr: altitude indiquée
INF Abbreviation for: inland navigation fix Fr: INF
in-flight meteorological information 
Specific meteorological information provided to international air traffic. 
. also called: VOLMET 
Fr: renseignements météorologiques destinés aux aéronefs en vol
in-flight refuelling Other expression for: air refuelling (AIRFL)
in-flight report Other expression for: air report (AIREP)
information request A message requesting that a communications search be carried out in a defined area utilizing government circuits and local telephone.
. abbreviation: INREQ
Fr: demande de renseignements
information service
An ATS consisting of the following:
(a)
aircraft movement information service (AMIS);

(b)
alerting service; and

(c)
flight information service (FIS).

Fr: service d’information
initial DND: A point 3 to 5 mi. prior to the threshold on the upwind leg, and usually 500 ft above the normal aerodrome traffic circuit, where military aircraft join the aerodrome traffic circuit to conduct an overhead break. Fr: point initial
initial approach Canada: Other expression for: initial approach segment (1)
initial approach fix The fix of an instrument approach procedure (IAP) at which the aircraft leaves the en route phase of operations to commence the approach. 
. abbreviation: IAF
Fr: repère d’approche initiale
initial approach segment
(1) Canada: That part of an instrument approach procedure (IAP) between the initial approach fix (IAF) or waypoint and the intermediate approach fix (IF) or waypoint during which the aircraft departs the en route phase of flight and manoeuvres to enter the intermediate segment.
. also called: initial approach
Fr: segment d’approche initiale
(2) ICAO: That segment of an instrument approach procedure between the initial approach fix and the intermediate approach fix or, where applicable, the final approach fix or point.