Why we do not see the shadow of an airplane flying at a height?

We don't see the shadow of an airplane flying at a high altitude primarily because the sunlight is so intense and dispersed that it diminishes the visibility of shadows at ground level. Additionally, the airplane is often too far above the ground for its shadow to be distinct or noticeable. The shadow may also fall on areas where there are no solid surfaces or where the ground is uneven, further obscuring it from view. Lastly, atmospheric conditions and the angle of the sun can also affect shadow visibility.