1) Image analysis system 2) Indicated air speed 3) Initials in a plane cockpit 4) Mph aloft 5) Plane-speed letters Found on https://www.crosswordclues.com/clue/ias
Indicated Airspeed. Airspeed indicated by the Airspeed Indicator, without correction for position error, altitude, or outside air temperature. Found on http://airodyssey.net/reference/glossary/