Unilever moved creative on Slim-Fast from Grey to Ogilvy & Mather after a pitch, sources said. WPP, which owns Ogilvy, is in the process of acquiring Grey in a deal set to be completed by the end of the year. Grey in New York had handled the weight-loss product line since 1987. Unilever spent $90 million last year on Slim-Fast ads and $35 million through July 2004, per Nielsen Monitor-Plus. Separately, Ogilvy bested Omnicom’s BBDO in a review to pick up Delta Air Lines’ estimated $20 million account, sources said. Ogilvy in New York and BBDO’s New York and Atlanta offices pitched with their media siblings, MindShare and OMD, respectively. Delta’s ads have been crafted by independent Brighthouse in Atlanta. Publicis’ Starcom in Chicago handled media.