The general field of the invention is that of electronic mission preparation systems, notably for aircraft pilots. The system comprises a removable touch tablet and an associated connection support or docking station intended to be mounted on an aircraft instrument panel. The connection support comprises a mechanical support comprising translational guiding means and a pivoting pallet comprising mechanical means for rapidly locking and unlocking the touch tablet This connection support also comprises a memory card and electrical connectors. These provisions together ensure both the electrical and mechanical connections of the tablet to the avionics system via the connection support.