Might be their only international schedule for the grand fleet of 10 outside France.
You might well be correct, but I have the inkling that they 'might' have been used on the Paris-Brussels and Paris-Geneva routes at one time. The Geneva route would've been technically an internal flight as it would have landed and taxied to the French side of the terminal. I liked the Mercure and subsequent visits to museums where they are resident, including internal tours, showed they were ahead of their time. Almost like the French Trident/VC-10 in respect of it's international appeal.