I have a question about Lounge access and mixed cabin itineraries.

If I have a mixed itinerary that's Q400 from PDX to SEA, then in F from SEA to LAX, can I use the lounge in PDX?

It may be moot, because if PDX is still taking PP entries I can use that to get in, but I might as well ask since it will probably continue to happen after traffic picks up and they start declining PP again.

I'm doing a bunch of my LAX-PDX trips in paid F via SEA through the first half of the year to get to 75K for next year, since F is really cheap right now and there's the stacked multiplier, but sometimes the schedule I want has a Q400 between PDX and SEA.