The project aims to validate trajectory-based operations use cases for optimised flight profiles, supporting sustainable air traffic growth. By downlinking airborne trajectories with enhanced conflict detection and resolution tools, and supported by lateral and vertical clearances, air traffic controllers can better anticipate aircraft trajectories. This enables continuous climb and descent operations with fewer tactical interventions and level-offs, reducing controller workload and optimising flight profiles. The project focuses on TBO use cases in the tactical execution phase for en-route and TMA operations, contributing to the finalisation of SESAR Phase C developed in SESAR 2020 and the realisation of the Digital European Sky vision in SESAR Phase D. It aims to validate performance benefits in terms of environmental impact, operational efficiency, capacity, safety, and cost efficiency. Key stakeholders, including flight crews and air traffic controllers, will be closely engaged to ensure operational acceptability, particularly regarding advanced automation aspects. Under the overall coordination of EUROCONTROL, the project team includes 14 ANSPs, 1 airspace user, 5 research establishments, and 1 university. A total of 21 validation exercises, including real-time simulations, are planned, with validation results for three SESAR solutions at technology readiness levels 4 and 6 due in 2026.