Understood and that is why I checked that the plane was there and if it was not there I was ready to take the 18h00 flight. AC may have known pilots would not make the connection but I could not.
Also AC offered me the flight through LHR but that was also making me miss one day out of 3, so it was not a possibility.
I never book connections this tight, but for whatever reason that is the only connection I remembered being offered at the time of booking. If they were others then it was because the other ones were much much more expensive.