American Airlines cargo traffic fell 2.6 percent in May in a fresh sign of weakness in the U.S. air freight industry.
American's weak May left the largest cargo carrier among the U.S. passenger airlines down 0.3 percent in cargo in the first five months of 2007 compared to the same period last year.
The airline has slimmed down its capacity this year, cutting back 3 percent based on measures of passenger seats. Cargo capacity figures were not available.
Cargo traffic at United Airlines also declined 4.2 percent in May, but the downturn was entirely the result of lost postal business, which was down 42.4 percent for United. Freight business, without mail, was up 4 percent for United in May and 2.4 percent in the first five months of the year over the same period in 2006.