The threat to summer holidays looming from jet fuel shortages

Step on to the tarmac at any major airport around the world, and you'll notice an unmistakable smell. A slightly sweet, oily scent, redolent of old workshops or antique paraffin lamps. It is as much part of the travelling experience as lukewarm coffee and queues at passport control. It is, of course, the pervasive smell of jet fuel.