Bifurcation and continuation methods have been widely used over the last two decades for the prediction of aircraft flight instabilities. These methods have also found application in control law design, and in devising recovery strategies from difficult flight conditions like spin. Very recently, continuation methods have emerged as an efficient technique for generating trim points in constrained flight for use in controller design, and for aircraft performance evaluation. Previous studies using bifurcation methods in the presence of constraints could not recover information about the stability of the trim points, and did not seek to trace departures from the constrained flight at points of instability. In this paper, we describe an extended bifurcation and continuation procedure that overcomes these drawbacks. The procedure is illustrated by computing trim points for two different level flight conditions: straight flight, and zero sideslip turns. Standard straight and level flight, and level turn performance plots are produced by this procedure with little effort. These plots also carry stability information of each trim point, and show all possible motions that depart from the constrained flight. The procedure can be applied to other constrained trim flights with equal ease. © 2000 by the American Institute of Aeronautics and Astronautics, Inc. AH rights reserved.