In his first 15 years Thompson operated a seasonal liner service to Canada and built up a fleet of a dozen vessels with trades extending to Cuba, South America, the Baltic, the Mediterranean, South Africa and the Far East. 1840 saw the launch of the first ship built at Walter Hood's yard in Aberdeen for Thompson, and this yard built most of his ships up to 1881. They included some of the world's finest
clippers. In 1842 one of his ships undertook an emigrant charter to New Zealand, and in the same year his first ship visited Australia. By 1846 his ships had become established in the Australian trade. Initially this was to Sydney, but with the discovery of gold at Ballarat the ships also traded to Melbourne. Thompson first established the
Aberdeen Line (or Aberdeen White star Line to distinguish it from John T. Rennie's Aberdeen Line) on the Australian trade in his own right in 1856. From that time, Thompson's ships were distinguished by their green-painted hulls, their white masts and yards and the red and blue house flag with the six-pointed white star which gave rise to the alternative name. Thompson entered the China tea trade in 1848. A regular voyage pattern was soon established: London to Australia with passengers and general cargo; Australia to China, Japan or Russia with coal; and thence via a Chinese port with tea. The famous clipper
Thermopylae was designed for this trade. On her maiden voyage in 1869 she broke records for London to Melbourne, Newcastle (NSW) to Shanghai and Foochow to London. Ousted from the tea trade by steamers in 1879, Thermopylae was deployed as a wool clipper on the Australian trade. In both the Chinese tea trade and the Australian wool trade her chief rival was
Cutty Sark. Thermopylae was one of only two composite (i.e. iron and hardwood) ships owned by Thompson. Thereafter his ships were mainly constructed of iron. They included Patriarch and Samuel Plimsoll. George Thompson had adopted the famous loadline recommendations long before they became mandatory in 1890. In 1881 Walter Hood's yard was sold, as the age of sail was coming to an end. From then on the Line built up an initial fleet of five steamers: Aberdeen, Australasian, Damascus, Thermopylae (2) and Nineveh. Initially they steamed out to Australia via Cape Town and returned via the Suez Canal, but from 1895 they came back via Cape Town. Thompson died in Aberdeen on 11 April 1895 and was buried in
Dyce churchyard. His safety track record as a shipowner had been exceptional, seldom losing a ship, and he never insured his ships against loss. Instead he invested the money he had saved in insurance premiums in the purchase of new ships and the maintenance of his existing ships. In this way he developed what has been called 'one of the greatest Lines in British merchant navy history'. ==Family==