I put an ITN on hold and then later in the day received an email:

Still looking for great prices from
Seattle, WA, to
Nashville, TN?

Here's the most recent^ price for travel departing Oct 03, 2012, and
returning Oct 10, 2012.

If your dates are flexible,
we've found an even lower^ price.

Depart on Oct 08, 2012, and
return on Oct 15, 2012.

I've never had anything like this happen for specific travel before. Something new? I did get a better price after reviewing alternatives. Thanks AA!

BTW - SEA-BNA is $120 one way using the 5% off code.