Yes, I have selected premium seats on Expedia as long as the freq flyer # is in the reservation in Expedia. I have *not* been able to change seats on nwa.com which was ticketed on Expedia, however, which I believe is the norm for all tickets not purchased on nwa.com. To change seats on expedia-booked tickets, go back to Expedia, bring up the itinerary, and it should have a link to change seats.