CDG-STN-MEM was disputed in Nov, Dec, and Jan (i.e. 3 months) In Feb the SIG withdrew the dispute and this sequence was not disputed in Mar either. The trip above starts in Mar, but the sequence, is actually flown in Apr. As a side note, it is disputed again in APR (don't understand this one). Bottom line is BC is in the right here. However, this is why the problem is much deeper than DP flyers.