What is a common advantage of true airspeed vs. indicated airspeed?

True airspeed provides a more accurate measure of performance because it represents the actual speed of the aircraft relative to the surrounding air. This measurement accounts for variations in air density due to altitude and temperature, making it particularly valuable for assessing performance in different flight conditions. As an aircraft climbs to higher altitudes, the indicated airspeed can remain constant while the true airspeed increases due to the reduction in air density. Accurately knowing true airspeed allows pilots to better understand their aircraft's performance capabilities, such as fuel consumption and flight time to a destination.

Indicated airspeed, on the other hand, is the speed shown on the airspeed indicator and does not reflect the performance accurately at high altitudes or varying temperatures. The other options present limitations regarding true airspeed, such as altitude, temperature, and performance reliability, which do not reinforce the significance of true airspeed as a direct measure of an aircraft's performance in flight.