Entry for the FedEx Innovation Challenge

Thanks go to Ben Li for this explanation of the science behind flight. The challenge is submitted as a picture. Here is the text of the challenge:

“The invention of modern flight allows FedEx to successfully deliver millions of packages around the world each day. Many move on board our fleet of Boeing aircraft. For this science challenge, identify and illustrate the fundamental scientific principle that makes flight possible.”

And thanks to Rakesh for “flying” !