I did a trip under this promo. Neither of the segments on NW metal showed up at all nor did the bonus miles. After a month I had to mail BP copies to SM to get credit. Looks like I will have to wait and then write again to get the AMEX credit. I did get the double miles on all 6 segments, when SM finally discovered that a trip on a NW 747 with "Delta" painted outside is actually part of a DL SM itinerary purchased on dl.com with a SM number.