Whatever his handicap or reduced mobility, it is necessary beforehand (at the time of booking and minimum 48 hours before) to notify the airline of its specific needs for assistance and the equipment to be taken on board to avoid any denied boarding. . The airline company can ask you for medical documents or for the material to be transported (dimensions of the wheelchair, type and power of the battery ...) in order to make sure to respect the flight safety conditions and the dimensions allowing its embarkation in the hold. It will then validate your reservation and indicate the procedure to be followed on the day of the flight. In case of refusal to validate your reservation, it must provide you with a written reason for this refusal.