After a three-year phase-in starting with its DC-9 pilots, Northwest Airlines is now using AD OPT's Altitude Pairing crew-pairing software for all of its 6,000 pilots and 11,000 flight attendants worldwide. ``It has more than met our expectations in terms of performance, and AD OPT's technical support has been excellent,'' said Jeff Putnam, director of Northwest Airlines' Crew Resources Dept. . . . The U.S. Army's Anniston Army Depot, a tank maintenance center, has chosen Computer Associates' Unicenter TNG to manage its information network.