The flight itinerary is Seattle-Chicago-Zurich with the Seattle-Chicago leg on United and Chicago-Zurich leg on Swiss. The return is the reverse with Zurich-Chicago on Swiss and Chicago-Seattle on United. I selected this routing because I wanted to purchase from United but fly Swiss for the transatlantic. I already have my seat selections on United through the reservation process, but not on Swiss. I have the Swiss confirmation number from the United web site, but, when I go to the Swiss site, I am apparently not allowed to see or manage the Swiss segments on the Swiss website due to the codeshare.
I could use some enlightenment on the process for online check-in on both outbound and return flights and seat selection for the Swiss legs so your input much appreciated. I've flown commercially frequently, but am still a bit inexperienced with codeshares. With United-Air Canada booked through United, I could use the AC locater provided by United on the AC web site to get to my reservation. Seems a bit different this time.