Duo Discuss X
Duo Discus DDX, N517DDX, is a 2007 'X' model purchased from the estate of Jack Harkin, our dear friend and advisor.  Jack did not do things half-way, so DDX is kitted out with the best instruments, including a transponder.  The features of the X model make it ideal for training and cross-country flight:  winglets, retractable landing gear with more ground clearance than older models, flaps attached to the airbrakes, landing gear controls front and back.