Edited sentence: At the subsonic airspeeds where the "U" shape of this curve is significant, wave drag has not yet become a factor, and so it is not shown in the curve.In aviation, this is often referred to as the power curve, and is important to pilots because it shows that, below a certain airspeed, maintaining airspeed counterintuitively requires more thrust as speed decreases, rather than less.The consequences of being "behind the curve" in flight are important and are taught as part of pilot training.The interaction of parasitic and induced drag vs.airspeed can be plotted as a characteristic curve, illustrated here