But the signs are not good. The International Air Transport Association, IATA, an airline industry group, revealed just last week that load factors are on the decline and that growth in revenue per passenger mile, the benchmark indicator of the airlines' fortunes, is starting to slow dramatically. The ratio of seats carrying passengers to empty seats fell in every region of the world by the latest count, with Europe the hardest hit, while the number of miles travelled per passenger is growing at a rate less than half that to which the industry has become accustomed.