The AC/SN codeshare arrangement is one that does not operate as efficiently or as effectively as other codeshares...."leaving" the bag in BRU for 3.5days confirms that. They act just like their SN heritage code predecessor...who once left a bag for a week in ORD when they had 5th freedom rights ORD-YUL-BRU, and it would have taken 2 days to ship it by bus if they didn't want to give it to AA... E-mail [email protected] and demand your fair share of compensation under EU regulations.