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The speed of an aircraft relative to the air. Among the common conventions for qualifying airspeed are: indicated airspeed ("IAS"), calibrated airspeed ("CAS"), true airspeed ("TAS"), equivalent airspeed ("EAS") and density airspeed.

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How are IAS/CAS and TAS used in flight?

I'm a new pilot, so it's possible I have misunderstanding here, but what I figured out (at least for general aviation) is that IAS/CAS are used to monitor aircraft behavior/performance characteristics …
Alexander Kovalevich's user avatar