characteristics which are given in the [*Base of Aircraft DAta*]{} (BADA) Aircraft Performance Model. Still, these values are only nominal and can be different from the real situation. Therefore, the SESAR project 5.5.2 [@SesarTP2012] concludes that sharing airline operational control data, like the mass and the speed schedule, could provide quick improvement to ground trajectory prediction, with limited investment. As a matter of fact, these parameters are determinants for computing the TP with a point-mass model.

More generally, a parametric approach refers to a model based on flight equations and aircraft characteristics. The point-mass model is an example of a parametric approach. As we will see, many parameters can be used to tune the model to reality. To generate trajectories, [@Gallo] uses six ordinary differential integrators depending on the longitudinal motion instruction. Similarly, [@Glover2004] and [@Kamgarpour2011] use hybrid systems to model the change of differential equations according to the control law and the aircraft states. A discrete space, e.g. an automaton, is defined to represent the modes of the system. Every mode defines the differential equations and creates trajectories in a continuous space. As seen in [@Glover2004], this model is well-suited for implementing BADA. [@Alligier] exposes a technique to find 