I think the AP one off orders move to the back of the line, repeatedly. Core and WL always get done in a more timely fashion. My perception is that the AP is a one built on the Core assembly line (unlike the one off PS), and has to wait until there are enough similar in fashion to warrant a build. I could be completely wrong, but it sure seems that way. Our WL 509 were April to October/November. Most AP builds go twice that, at least.