ENAC (École Nationale de l'Aviation Civile), the French civil aviation university, offers a comprehensive training program for aspiring air traffic controllers. The program combines theoretical classroom-based instruction with practical hands-on experience using simulators and real-time scenarios. ENAC's proprietary software, ELSA (ENAC Light Simulator for Atc), plays a crucial role in providing online air traffic control simulation exercises for training purposes. This paper focuses on the implementation of trainee clearances in ELSA, specifically how these clearances are converted into commanded values which feed dedicated guidance control loops for a point-mass aircraft model. The simplicity and realism of the point-mass aircraft model contribute to an effective Air Traffic Control (ATC) training experience.