I just got too wondering about this, if people are using too many PKs, that is on every single ticket they fly, is recourse from NWA possible. Like a blacklist that lowers upgrade chances or other actions that negatively impact your travel or maybe an eventual ban from Worldperks.

I know the probability is low, but in the fare type it clearly spells out when you use a PK fare, and if all your fares a PK you'd think NWA would eventually catch on and step in.

What do you guys think? A possibility?