Abstract: A winglet and methods of operating an aircraft using the winglet. In some embodiments, the winglet can be mounted to the wingtip of an aircraft and has three segments or portions, namely, a mounting portion, an upwardly extending portion, and a reverse portion, or a portion that extends in an inboard direction.

Abstract: A modification of a 727 airplane, including a change in wing profile, to affect flight characteristics and the engines to lessen noise, such that the takeoff and landing procedure is modified so that engine power may be reduced, permitting the modified aircraft to meet the latest noise requirements without substantially reducing pay load.

Abstract: A system is provided which enables winglets to be added to existing wing structures of 727 model aircraft to increase fuel efficiency while providing a means for redistributing additional loads created by the winglets so that modified aircraft can be operated safely and within government regulations. Re-setting of existing wing flaps and ailerons safely offsets the load increase caused by the addition of winglets and also contributes to increased fuel efficiency. An airplane wing modification kit comprises a winglet and modified components for re-rigging the settings of ailerons and flaps of existing 727 model airplanes.