Not sure if this is the right thread, but thought this was interesting, not really sure if it's a fare thing or a website thing or some combo.

I'd been looking for a cash booking YYZ-CDG, and in the end found an option on Matrix through google flights that would not come up through the AC website search. The direct link from Matrix to the booking page did work, and this was an apparently a bookable fare. When I asked our corporate travel agent to replicate it he was unable, the same flights and fare classes would price out much higher. The only difference was that their system (and the AC website) was pricing it as "Business Lowest (Mixed Cabin)" while Matrix managed to get it priced as "Latitude (Mixed Cabin)"; in both cases the flight included a short Y domestic leg and then a TATL J segment. Anyone see this before or know if this is replicable?

FWIW the TA eventually managed to price it to match Matrix by feeding their system individual segments and it booked into Y and Z class on the outbound and P and Y on the return.