
United reportedly explored a merger with Delta before later approaching American, but Delta’s preliminary review did not advance to formal talks because antitrust barriers were seen as too high.
United Airlines approached Delta Air Lines in 2025 about a potential merger before later approaching American Airlines, according to a Wall Street Journal report. Delta reviewed the idea after United CEO Scott Kirby contacted Delta CEO Ed Bastian, but preliminary due diligence did not lead to formal negotiations because the regulatory obstacles to combining two major U.S. carriers were viewed as overwhelming.