NWA still has it clearly listed on their website:

The following partner inventory classes will qualify for Elite qualifying segments:

Airline Fare Class
KLM B P F J C Z Y S M
Continental A C D J Z Y H K
Alaska Airlines F U Y B
Air Alps Y B
Air Europa J C Y
Hawaiian F J P Y V
Malev C D M B

http://www.nwa.com/freqfly/elite/overview.html

Rob