Would also second what was said about not assuming anything on mileage credit when dealing with partner airlines. Rules are convoluted to the point of being ridiculous, with lots of 50%, 25% or 0% gotchas varying by class booked. I got the $257 all-in ATL-SCL deal on DL "partner" AV, for example, but the fare class earned zero miles on AV-operated flights. So I just had the DL-operated ones credited to NW. Was also on the AF trip EWR-FCO; the EWR-CDG and v.v. got full credit on NW, but the CDG-FCO got only 25%. Examples like that abound.