Delta Air Lines plans a 2 percent year-over-year capacity reduction for the second half of 2011

, a reversal from its previous 2 percent growth plan, and US Airways lowered its planned full-year capacity growth to 1.5 percent from 2 percent, the carriers revealed during a JP Morgan aviation conference. Delta said it would reduce capacity on transatlantic routes in the second half of the year by 4 percentage points, and its U.S. capacity for the last six months of 2011 would be down 3 percent. US Airways plans to reduce fourth-quarter capacity by up to 2 percent.