I can only speak for the MD-11. This concerns secondary line.

Scheduling takes a snap shot of your schedule after the SLG opens. People are bidding min days off, and will be given credit for carryover days. After secondary lines are built, they will take the number of credit hours awarded, then give them PNP to make up for their loss. Simple formula:

Average BLG - Secondary line credit hours = PNP

So, now that the snapshot has been taken (and they are given credit for min days off), they proffer their carryover trips. They’ve freed up the end of the month (where their carryover used to be) and use their PNP to feast on the best trips. Then they do it again next month, and the next...

For those in the MD, if you’re wondering how they seem to have an endless supply of Priority time, that’s how. PNP is only awarded on Secondary lines when bidding min days off.

Again, another well intended plan, but not used as intended. And don’t forget, PNP never expires so the FO Wolfpack will bring that with them to the left seat...