Hi!
NWA went to unlimited offline jumpseaters in the back on Feb 1, I believe. As long as there's space in back (or up front if you're CASS) you're on (as long as the Captain OKs it).
cliff
YIP
This is true, but there won't ever be an open seat in the back. More like oversold with 25 non-revs ahead of you. I would steer clear of NWA. There are so many other airlines out there that will treat you with respect and dignity.