Omnicom's DDB is the globally aligned incumbent on the business. The network declined to say whether or not it was involved in the pitch.
Meanwhile, the Singapore-based airline SilkAir is believed to have shortlisted six agencies to contest its $1 million account.
Ogilvy & Mather, the incumbent, will line up against Grey, BatesAsia, Saatchi & Saatchi, Young & Rubicam and JWT.
SilkAir, a subsidiary of Singapore Airlines, operates scheduled services from Singapore to 26 cities in South-East Asia, South Asia and China.