Originally Posted by luv757

You'd only see secondary vacancies on a snapshot in a NBFO category if it drops below the min. Anything between min and max usually doesn't show up until the final if manpower planning elects to backfill above the min. So say CLE737FO has a min max of 50/60 and is staffed to 60 (I'm making numbers up because I'm too lazy to go look at what they actually are but the point remains). 11 FO's bid out on a snapshot so you'd see 1 unfilled vacancy to get to the min of 50. If 5 bid out on a snapshot you probably won't see any vacancies. Final award is up to whatever manpower planning decides as long as it falls between the 50/60 min/max.

The UPA 8C4a reference secondary vacancies have to do with training capacity. So if a current IAH777CA bids to SFO, they don't require training. Instead of a slot going unused they could award an additional vacancy over what's published to get someone into a training slot.