The Carlyle Group agreed to acquire a stake in American Express Global Business Travel, a business partner for managed travel, from Certares, an investment management company. Financial terms were not disclosed. “This investment validates the success of the joint venture and underscores the strength of our long-term growth strategy. We are pleased to continue working with American Express and nearly all of our original investors, as well as welcoming Carlyle, GIC, and others to the group,” Greg O’Hara, Certares Founder, and Senior Managing Director, will continue as GBT Board of Directors Executive Chairman.