BOSTON–(BUSINESS WIRE)–TA Associates, a leading global growth private equity firm, today announced it has completed a significant investment in Radixx International, Inc., an industry-leading provider of travel distribution and passenger service system software for airline reservations, distribution and merchandising. Financial terms of the transaction were not disclosed. Radixx offers a cloud-based SaaS Passenger Service System (PSS) designed to help airlines increase profitability and maxim