Looking at the LP765 from LIM to GRU on 5th September, the aircraft only seems to have an economy cabin - that's certainly all that LAN will sell, and the seatmap definitely agrees that there's just one big economy cabin.

What's weird is that they operate a codeshare with TAM on this route, flight JJ8705, and TAM seem to want to sell a business seat to me, expertflyer shows J4 availability.

Does anyone have any idea what the situation is here?