revision preference src: On August 21, 2007, Delta named Richard Anderson, former CEO of Northwest Airlines and executive at UnitedHealth Group, as a replacement for outgoing CEO Gerald Grinstein. Anderson assumed the post on September 1. <SEP> tgt: On August 21, 2007, Delta named Richard Anderson, former CEO of Northwest Airlines and executive at UnitedHealth Group, as a replacement for outgoing CEO Gerald Grinstein. CEO assumed the post on September 1.