ATLANTA — Delta Air Lines Inc. will cut system capacity 3 percent next year and plans to shed more jobs, as it reported a quarterly loss Thursday bigger than a year ago. Executives were hesitant to say when the world's largest airline will grow again amid an economic recovery that is only starting to take shape. Volume and revenue from corporate customers remain down by double digit percentages, but the margins at Delta have been improving in recent months. Leisure travelers are starting to take to the air again, but they are paying smaller average fares, hitting the airline's bottom line. "They continue to be under pressure – budgetary pressure and pressure on the economic front," Delta President Ed Bastian said of customers during a conference call with analysts and reporters. Delta, based in Atlanta, has been cutting costs by parking planes, eliminating jobs and other initiatives. Additional job cuts are coming, Bastian said, though he didn't offer specifics.