The Transformation into plane mode is super well thought out, especially in the legs. Each leg is made up of two halves of the back end of the plane, but each half comes from a different side (ie: One leg has both the tail end of the left side of the plane and the midsection of the right side of the plane), and everything folds together in a really neat fashion with the hips folding in closer to collapse everything into position. Peaugh has a video of the full transformation if you want to check out how it's done
https://www.youtube.com/watch?v=ohO5_XXMd3Y 