That's what Stormy Daniels said!
I'm not certain if this could be a hold-up, but LUS does not have in-house Air Freight in the hubs, whereas LAA does. At one point, I think the IAM was attempting to gain freight back, which was outsourced in BK by the company prior to the merger.
The same scenario is true with Catering -- LUS has it, LAA does not. It could be the company is arguing that they want to outsource BOTH catering and freight, or a variation thereof. Either way you cut it, it's a loss of scope for the union(s).
Maybe CB, or someone can clarify if it is permissible for them to discuss the matter.