Am on PPT/LAX/SEA on a reward in O(reward business) this January, though my connecting flight got moved by Alaska so I'm stuck with a 4 hour layover at LAX because Alaska won't move me forward to an earlier LAX/SEA leg.
I also heard some rumblings about the partnership ending because of Air France being a partner with Delta and Delta/Alaska now being larger competitors. (IE, why LAM is out with Alaska). Haven't heard anything further.
Alaska seems to be getting less and less availability route wise with the majority of it's partners. Very limited routes on generally older interiors. Or in some cases(Australia/NZ) no availability at all outside of economy rewards. That said, I don't know how much negotiating power Alaska has with these other carriers and PPT is likely a very popular route for rewards. Was pretty stoked to be able to find one.