All 64 people aboard an American Airlines jet that collided with an Army helicopter were feared dead in what was likely to be the worst U.S. aviation disaster in almost a quarter century, officials said Thursday. At least 28 bodies were pulled from the icy waters of the Potomac River after the helicopter apparently flew into the path of the jet late Wednesday as it was landing at Ronald Reagan National Airport near Washington, officials said. The plane carried 60 passengers and four crew. “We don’t believe there are any survivors,” said John Donnelly, the fire chief in the nation’s capital. “We are now at the point where we are switching from a rescue operation to a recovery operation." The plane was found upside-down in three sections in waist-deep water, and first responders were searching an area of the Potomac River as far south as the Woodrow Wilson Bridge, roughly 3 miles (4.8 kilometers) south of the airport, Donnelly said. The helicopter wreckage was also found. Images from the river showed boats around the partly submerged wing and the mangled wreckage of the plane’s fuselage. If no one survived, the collision would be the deadliest U.S. air crash since 2001. There was no immediate word on the cause of the collision, but officials said flight conditions were clear as the jet arrived from Wichita, Kansas, with U.S. and Russian figure skaters and others aboard.