We're now at the point where we've had 12months of post-CBA line creation, which means the Target Line Value is actually coming into play. The company has been pushing ALV as high as they can for the previous 12 month, and now the TLV is above the limit, meaning they need to add more bodies in a bid status like JFK 320 FO. It will likely continue and I wouldn't be surprised to see more TDYs in coming months. Check CBA 25.I.1 and 2 for info about TLV and ALV.