Here is a surprising one, at least to me: looking at TLS-YYC return, with first leg on Sept 8 at 10:15 am, TLS-FRA-YYC, business low, the AC codeshare shows one seat available, with TLS-FRA in J.
With the actual LH flight number, it gets: "Mixed Cabin: Between Toulouse (TLS) and Frankfurt (FRA) you will be seated in Economy Class."
When I would normally expect the opposite.