 Tourism is an industry where the influence of air transport services is more obvious . In 2005 some 22 million overseas visitors arrived by air , spending around £ 12 billion ( 1 @.@ 1 per cent of GDP ) and supporting 170 @,@ 000 jobs in the tourist industry . In the same year air travel also accounted for 36 million trips abroad by UK tourists , and UK tourists as a whole spend twice as much abroad as overseas visitors spend in the UK . This has led to the assertion that aviation represents a " net negative effect " on the UK tourism industry , and that restraining demand for air travel would encourage more domestic tourism , with the consequent economic benefit of reducing the tourism deficit . 
