I will be booking a November trip BOS-NBO, DAR-BOS shortly with Delta/KLM. I put my November dates in the Delta website to see how much extra the the Economy Comfort seats would be and I noticed that I could not select seats for the KLM operated segments. I went on the KLM website and did the same thing, but I did not see seat selection as an option at all until online check-in. I could only indicate a preference of aisle or window. Is this how KLM works, or is it because I am trying to book 9 months out? Or, will I be able to use my Delta confirmation number to pick the KLM seats after booking?