Flying skills
True airspeed
At a glance
Meaning of True airspeed
The aircraft's actual speed relative to the surrounding air.
More about True airspeed
True airspeed, or TAS, is determined from air-data measurements with the appropriate corrections. At altitude it is usually higher than indicated airspeed for the same indicated value.
Ground speed additionally includes the effect of wind. Indicated airspeed, true airspeed and ground speed describe different quantities and cannot be interchanged.