On 10 May 1934 White Star Line merged with its old rival the Cunard Line and the ship became part of the fleet of the newly amalgamated Cunard-White Star Line, both ships however retained their White Star livery and houseflag, but with the addition of the Cunard houseflag. The following year "Georgic" and "Brtannic" were transferred to the London−Le Havre−Southampton−New York route, and "Georgic" commenced service on this route on 3 May 1935, making "Georgic" the largest ship to sail up the River Thames and use the Port of London. She continued to serve this route until the outbreak of World War II in 1939. On the outbreak of war, "Georgic" was not immediately commandeered, but was instead transferred back to the Liverpool to New York route in September 1939, and made five round trips before being requisitioned for trooping duties on 11 March 1940.