So when have you been flying with the airlines? Have you ever looked out the window and noticed winglets on the end of the wings on an airplane and ever wondered what they are? What are split winglets? Why does the Boeing 737 Max have split winglets? The Seven Three Seven Max assisted with Boeing's trademark split winglets, also called split skimmer winglets. Dubbed at the 737 Max Split Winglets, they are a unique design incorporating features from blended split skimmer and racked winglets