The climbDescendKind optional parameter is used to determine the expected behaviour of the aircraft to reach the Cleared Flight level:
- it shall be filled in the input if the aircraft is expected to start its evolution immediately after the application start point
- if it is filled, the CLIMB (resp. DESCEND) value is required if the Cleared Flight level is higher (resp. lower) than the actual flight level at the application point. In case the flight is holding, and if the CFL input application point is immediate, the actual flight level to consider is the one over the holding entry point
- if it is filled, it is optional to input also a target point, which is the trajectory point at which the aircraft is expected to end its evolution (given via the applicationEnd.routePointId parameter)