A Northwest spokeswoman said no review is currently under way. Interpublic Group of Cos.' Carmichael Lynch, Minneapolis, handles Northwest domestic advertising and shares international work with Asia-Pacific offices of WPP Group's Ogilvy & Mather Worldwide.
Carmichael Lynch and Ogilvy last week said they knew of no impending moves by Northwest.
Marketing management changes
However, another executive familiar with Northwest agency relationships said Carmichael Lynch's ties with Northwest have suffered following marketing management changes at the airline.
Northwest spent $33 million in measured media last year, according to Taylor Nelson Sofres' CMR.
In separate news, Frontier Airlines has received some 75 responses to its request for proposals for an agency search and expects to narrow the list to about 20 before selecting five finalists this fall, a spokeswoman for the airline said.
The principal criteria will be creative abilities, the spokeswoman said.