Now that we know about the dynamics of real fluids we can understand a few things about aerodynamics--the science of flight. We first want to understand how lift is produced by an airfoil (a cross section of an airplane wing), and how the airfoil should be engineered to maximize lift and minimize drag. Then we'll move to whole airplane, the motion of which requires thrust, which can be generated by either propellers or jets. Finally, a few notes on high-speed aviation and compressible fluid flow.