The term 'FLY FEATURES' can be broken down into two crossword solutions: WINGS (5 letters). The WINGS of a fly are the most important feature that allows it to fly. They are thin, membranous structures that are attached to the thorax of the fly and are used to generate lift and thrust. The WINGS of a fly are covered in tiny hairs that help them move through the air more efficiently. The WINGS also have veins that help to strengthen them and provide support for the flight muscles.