Unit revenues at Delta Air Lines increased 5.5 percent, year over year, in January based on shrinking capacity and increased activity on transatlantic routes. While most of this gain came from increases in the passenger market, Delta’s cargo activity did well in January, showing a modest improvement over results from January 2012. Cargo ton miles ended the month at 175,124, a 0.5-percent year-over-year increase. Delta is the first of the major U.S. cargo carriers to r...