At the bottom of this page, http://www.nwa.com/services/bustrav/wbc/#fleet it shows some antique aircraft that belong in a museum:

* New World Business Class is available on intercontinental flights using Northwest 747-400 or Airbus A330 aircraft or KLM 777 or Airbus A330 aircraft. Classic World Business Class will continue to be offered on intercontinental flights using Northwest 747-200 or DC-10 aircraft or KLM 747-400, 767 or MD-11 aircraft. Information subject to change.