Mail contracts were the basis of P&O's prosperity until the Second World War, but the company also continued to become a major commercial shipping line and passenger liner operator. In 1914, it took over the British India Steam Navigation Company, which was then the largest British shipping line, owning 131 steamers. In 1918, it gained a controlling interest in the Orient Line, its partner in the England-Australia mail route. Further acquisitions followed and the fleet reached a peak of almost 500 ships in the mid-1920s. In 1920, the company also established a bank, P&O Bank, that it sold to Chartered Bank of India, Australia and China (now Standard Chartered Bank) in 1927. At this time it established a commercial relationship with Spinney's of Haifa, that developed into a major regional high-end grocery store chain, which eventually provided shipping services access to much of the Middle East. Until 1934 it operated liners from Key West, Florida to Havana; then it operated from Miami to Cuba until 1960.