<p>Fig. 4. Due to the shape of an airplane wing, air flow above and below it creates a pressure differential, where more pressure is exerted on the bottom of the wing than on the top, leading to upwards lift.&nbsp;</p>

Fig. 4. Due to the shape of an airplane wing, air flow above and below it creates a pressure differential, where more pressure is exerted on the bottom of the wing than on the top, leading to upwards lift. 

Image made by Emily Sesno