A passenger jet in the air increases its speed. does the downward force of air on the top of the wings increase or decrease? does the net lifting force of the air on the wings increase or decrease?

The descending force diminishes that of the net lifting force increments for the fact that air goes over the wings of the aircraft

Pressure is the typical power per unit region applied by the air on itself and on surfaces that it touches. The lift drive is transmitted through the weight, which acts opposite to the surface of the airfoil. The air keeps up physical contact at all focuses. In this way, the net power shows itself as weight contrasts.