This week marks the 75th birthday of the Piper Cub, and last week Fly Magazine published their top 100 aircraft. Which begs the question: What are some of your favorite aircraft? Here are a few of our staff favorites: Fairchild PT-19, WACO CUC-1, Beech Barron, ICON A5, P-51 Mustang, de Havillan Beaver...actually we could sit here all day and keep naming ones we love, but we'll let you guys take o…