I flew AF a few years ago on a ticket purchased on CheapTickets.com (bos-cdg-fco) and we did not get miles or MQMs for the AF N fare. This was some sort of discounted fare that is not on the list of qualifying fares on the DL website but I did not know any better. Make sure to check the fare bucket as soon as (or before) you are ticketed to verify it is on the list. Based on the DL site now it appears that N does qualify but it did not for me.