The caution with this is of course the last year and a half has been an unprecedented hiring explosion caused by mass retirements and a V shaped recovery of travel demand after COVID. As an example, Delta could have had Captain awards for the 757/767-300 go unfilled, but in the last minute the company pulled back on some of those slots from the initial posting. As far as I'm aware, United has had some Captain slots go unfilled but they have contractual limits to how long pilots must be on property to be awarded an upgrade.