DL.com can't let me pick exit rows or other preferred seats on AS codeshares. Since the AS PNR is not displayed anywhere on DL.com nor will AS.com let you look up a flight with non 027 ticketstock I as usual have to call DL SMS to get the AS PNR which is annoying. What was odd is that when I called DL this time the agent said there was no AS PNR was included in my ticket. The agent thought was weird, but had no recourse so then I had to call AS and ask them to look me up. Things are far from Deltamatic which is frustrating. Does anyone have better AS codeshare management seat selection strategies on DL?