NEW YORK (AdAge.com) -- Seven months after winning it, Interpublic Group of Cos.' Mullen has resigned the $8.6 million Eos Airlines creative account. Spokesmen for both agency and client confirmed the companies have parted ways over "creative differences."

"For the time that we did work together," said Eos spokesman Roberto Lebron, "we were very pleased with their work. It's safe to assume we'll be out there soon [looking for a new agency], but I have no details [about a review] now."

Ads launched in April
Mullen's only work for the luxury airline launched in April and focused on the "uncrowded" and "uncompromising" qualities of first-class only travel.

Eos is one of a few airlines to offer exclusive service to 48 (or fewer) passengers crossing the Atlantic. Like similar airlines such as Maxjet and Silverjet, a single round trip from JFK to Stanstead airport in London could cost $3,000 to $9,000.

In recent months, however, legacy airlines Virgin and British Airways have announced plans to imitate the luxury door-to-door service.

Previously, Eos' account had been handled by Magnetik before Mullen won the work.