A descent profile normally associated with a published arrival (STAR) and designed to allow maximum practical use of a CDO. It starts from top of descent, taking onto consideration the limitations of the local airport, airspace, environment, traffic and aircraft capabilities, and ATC. To the extent possible the descent profile is comprised of idle-power performance descent profile segments and geometric descent profile segments that maximize altitude, minimize the thrust required to remain on the path, terminate the path at the desired end location and satisfy the altitude and speed constraints along the closed path design. Note.- OPD is one method of facilitating CDO.