I'm sure this has been covered ad nauseum, but the search function is not working for me. I can only pull results from the last couple of days, even when I select "A Year Ago."

Anyway, as a newbie Silver, I have a couple of questions about seat selection:

1) When selecting seats online now (nwa.com), I am able to select "P" seats but not "E" seats. Are the exit rows selectable online? If yes, when and by whom?

2) A routing I'm considering for later this month is pricing much cheaper via Expedia. Will I still have access to premium seats? Will I be able to change seats or check in via nwa.com? Will EUA work properly on an Expedia ticket (ticketed as CO but entirely on NW metal)?

Thanks!