>>>> am starting to fly again domestically this month and wanted to purchase this ticket, but then I ran into the rule that no seat assignments are made until 90 days from the day of department.

99% of the time I get the seat I want by going to:
http://www.timeanddate.com/date/dateadd.html
and subtracting 91 days from the day of travel, and then about 10pm that night going online at www.nwa.com and selecting the seat. The computer usually automatically pops me into the 2nd row of coach, and I just change it to the bulkhead.