Airlines say cargo business is weak and the latest figures from the International Air Transport Association validate their bearish state of mind. The airline organization now estimates that global air cargo traffic in 2012 will contract 0.4 percent from last year’s level. In June, it anticipated cargo growth of 0.3 percent for the year. Flat business isn’t great, but it’s better than falling back. Through September, cargo capacity grew 3 percent more than demand. Matching cargo dem...