Alaska Airlines

Just as a query regarding flying on Alaska Airlines from San Diego to Seattle in economy.

Alaska Airlines fly this route directly so planning to book.

I am a Qantas gold. 

At a premium price it is sold ticketed via American Airlines.

I was wondering about the availability of usual American Airlines privileges for Qantas Gold in this instance, in particular 

- seat selection ability( it's about 3hrs) 

- free first bag

- lounge access ( I had read in a prior article that Qantas gold is denied lounge entry in Seattle when flying alaskan)

Thanks for your insights!