Yes, I'll have to wait and see how things settle out. But I do think I figured out what happened: When I booked the flight close to a year ago, the were two flights scheduled from IST to SEA on Oct 13, TK213 and TK203. Now there is only one flight, TK203. I'm suspecting that they canceled TK213 and scrambled the seating for TK203 in an effort to concatenate the passengers from the canceled flight, and in the process the business class cabin became completely full.