I am trying to better understand upgrade priority list for domestic flights when Y/B/M fares are involved. My understanding is that is goes as the following:

1. Any fare class fare with GS pluspoints. Priority first goes by status and then fare class.
2. Y/B fare class with priority going by status.
3. M fare class with prioirty going by status.
4. All other fare classes with 1k plus points and then status.
5. Status and then fare class