If the answer is out there, I couldn;t seem to find it by searching...

What is "P" class on NW? I have some flights which I am trying to elite upgrade on but being told it is sold out which read:

P8 F0 Y9 B9 M9 H9 Q9 V9 K9
P9 F0 Y9 B9 M3 H2 Q2 V1 K0

These look like kind of empty flights, especially the first one. Are P first class seats being held for sale? And F seats available for reward/upgrade? Thanks if anyone knows.