I booked this code share on AA in N-class with AA last night for a flight in late November. Will then fly IB from BCN to Mallorca for an overnight. The cheapest IB return fare is 14500 pasetas in K-class, the full Y-Class is 24200 daytime and 18200 on night flights (20800 in business, C-class). I will book one of these tomorrow after confirming eligible IB fares, both for the 100K promo and for crediting mileage to both Cdn+ and AA. From reading the various messages on IB, I am uncertain about one of the discount fares on a single ticket, and might rather opt for two one-ways on separate tickets and files so I can credit one leg to Cdn+ and the other to AA without hastle.