Ha! Good question. Probably crew that were supposed to work on a flight on some other airline, which was likely delayed....a lot longer than the WN flight.
Actually, was just going to comment on this thought:
Considering the situation a three hour diversion to Yeager is pretty remarkable.
Was just telling a friend that I'm not sure I'd ever move to an area without WN, and not the least reason is the fact that, anecdotally, I feel my chances of a significantly delayed flight are an order of magnitude less. Just really helps that they're not running a billion kinds of aircraft all over the country and stranding you every time there's a weather event 1500 miles away.
All this is to say - glad to hear nothing serious transpired. I could easily have been on that flight, being a BNA transplant from BWI a few years back. Good job, flight crew.