Delta shares fall 10 percent on lowered outlook; drags down rivals

The No. 2 U.S. airline said it now expected total revenue per available seat mile (TRASM) - a closely followed measure of airline performance - to rise about 3 percent, less than the 3.5 percent growth it forecast earlier."While close-in yield momentum continues, the pace of improvement in late December was more modest than anticipated," Delta said.Smaller carriers United Continental Holdings Inc slid 5 percent, Southwest Airlines Co closed down 3.2 percent, and JetBlue Airways Corp slid 1.7 per