There are several synonyms for the phrase "wing flat," each conveying different shades of meaning. "Plane wing" suggests a more technical or aeronautic context, while "wing panel" may indicate a larger structure. "Plane panel" is slightly more generic and could refer to various types of panels on an aircraft. "Aerofoil" is a more specialized term that denotes a streamlined shape designed to produce lift, while "airfoil" is a more general term for a body designed to move through the air. Lastly, "winglet" refers to a small wing-like structure that helps reduce drag and improve fuel efficiency on some aircraft.