Another answer may be that it was too far out when you initially purchased the tickets to get a seat number assignment. NWA's system, at the time I worked, would only allow seats to be assigned 89 days out from the flight. 90+days you could request seats and that request would sit in a queue and then it would be generically requested automatically at the 89th day. If it was not requested when booked, then yes, you would only get them upon check-in.
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