Delta Air Lines on Monday cut its financial forecast for the first three months of the year, saying that growing economic concerns among businesses and consumers had lowered demand for domestic travel. The airline’s warning was the latest sign that the U.S. economy, or at least perceptions of it, have been weakening in part because of changes in federal policies announced by President Trump. Delta said it now expected quarterly revenue to rise by at least 3% from a year ago, down from a minimum gain of 7% it had projected just two months earlier. Delta’s share price, which fell more than 5% in regular trading on Monday, tumbled an additional 12% in extended trading after it published the update. “The outlook has been impacted by the recent reduction in consumer and corporate confidence caused by increased macro uncertainty, driving softness in domestic demand,” the airline said in a securities filing. The airline published the update alongside a presentation it plans to deliver on Tuesday at the J.P. Morgan Industrials Conference. In addition to the weakened confidence, Delta said fewer passengers were booking flights on short notice. But it added that its expectations for revenue growth from high-end travel, international flying and loyalty programs were unchanged. The bad news was not a complete surprise. One financial analyst, Savanthi Syth of Raymond James, said in a note last week that the airline had probably lost some momentum in February from a slowdown in government travel, bad weather and customer anxiety after an airplane operated by a Delta subsidiary flipped after landing in Toronto. Still, Syth said that demand for flights over spring break appeared to remain strong and that other airlines had not been able to make gains at Delta’s expense. While some airlines have faced a variety of challenges recently, Delta and a few others have benefited from strong demand for premium airplane seats and international flights.<br/>