Back when I was studying for my private pilot's license, my instructor once asked me out of the blue (as he sometimes would),


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Back when I was studying for my private pilot's license, my instructor once asked me out of the blue (as he sometimes would), "What makes a plane fly?" I began to attempt a description of how a wing produces lift and Bernoulli's principle and such-like, only to have him stop me and provide the answer. Money makes a plane fly.