When I finished class in Nov the word from some union, UA & CO management was that UAL wanted to start recalls end of Jan and CO manpower planning asked for it to be delayed till fall. That was to keep trained "New Hires" on the line till summer was over. Overall manpower management guy is CO. The recall notice had to start by 1 Feb to achieve the UA goal of having recalled pilots on the line by May.
Guess CO manpower won the argument.