I bought a ticket in C on LH stock, that has an AC TATL leg. It is booked into LH fare code P, which is some sort of discounted business class code for LH. My LH confirmation with the AC leg says 'Business' across the board.

When I looked at my booking on AC.com, it shows my flight as the codeshared LH flight number, but then it says 'Tango', since I guess P is discounted economy at AC. Alarmed, I immediately called AC and did indeed confirm that I'm in Executive First, and also got a seat assignment.

So, any ideas what AC fare code an LH P fare maps to?