The business-focused title, which is distributed free to around 350,000 commuters in the capital every morning, has partnered with a number of key retailers and online service providers as part of an overhaul of its web presence.
GTM will white label their existing meta search engine into the City AM website alongside a similar service from luxury accommodation aggregator, Tablet Hotels.
The deal for GTM follows the recent launch of its Bizclasstravelmarket.com site.
CityA.M.com web editor Kam Patel said: “GTM were able to provide us with a unique, fully customised flight search engine that we believe will add great value to CityAM.com users”.
Chief executive Dave Simmons said: “Following the success of GTM’s bizclasstravelmarket.com, we are really delighted to be able to provide further opportunities for our travel partners to reach the affluent traveller through our new partnership with CityA.M, one of the fastest growing media titles in London”.