ST. LOUIS — All flights between Lambert and Ronald Reagan National Airport in Washington, D.C., have resumed after an American Airlines jet carrying 60 passengers and four crew members collided with an Army helicopter.

According to the FAA, Reagan airport was closed at 8 p.m. last night and reopened late Thursday morning. Four flights, two departure and two arrivals, were canceled.

At least 28 bodies were pulled from the icy waters of the Potomac River Thursday morning. Crews were still searching for other casualties but did not believe there were any other survivors, which would make it the deadliest U.S. air crash in nearly 24 years.

“We are now at the point where we are switching from a rescue operation to a recovery operation,” said John Donnelly, the fire chief in the nation’s capital. “We don’t believe there are any survivors.”

There was no immediate word on the cause of the Wednesday collision, but officials said flight conditions were clear as the jet coming from Wichita, Kansas, with U.S. and Russian figure skaters and others aboard, was making a routine landing when the helicopter flew into its path.

“On final approach into Reagan National it collided with a military aircraft on an otherwise normal approach," American Airlines CEO Robert Isom said. "At this time we don’t know why the military aircraft came into the path of the ... aircraft.”