Read comments for 'Growth in numbers'According to the World Tourism Organisation, there will be 1,500,000,000 airline trips made by the year 2020. That’s a lot of airmiles. Of course, a big rise in fuel prices could put an end to this since nobody has yet discovered a serious alternative for jet fuel. Equally, another outbreak of SARS or another big 9/11 style attack could also move the numbers in the opposite direction.
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