Investigators have recovered most of the airplane and helicopter from the Potomac River, but continued searching for objects on the river floor.

Salvage crews have been working to recover the wreckage of the American Airlines jet and the Black Hawk helicopter.

Investigators searching for wreckage from last week’s deadly midair collision between a US military Black Hawk helicopter and an American Airlines plane near Washington, DC, conducted an overnight scan of the Potomac River where the aircraft fell using advanced imaging technology to map the riverbed and locate debris.

A figure skating tribute will take place in Washington, D.C., in early March to support victims of the midair collision and crash outside Ronald Reagan International Airport.

Ari Schulman told NBC Washington that he saw the plane crash while driving on the George Washington Parkway, which runs along the airport. He said the plane's approach looked normal, until he saw the aircraft bank hard to the right, with "streams of sparks" running underneath, illuminating its belly.

Wind gusts and tidal conditions could slow operations today as officials try to pull wreckage from the icy Potomac River.

Investigators trying to figure out what led to the deadly midair collision between a US military Black Hawk helicopter and an American Airlines plane near Washington, DC, last week will brief lawmakers Thursday on what they’ve learned after combing through data from both aircraft and air traffic control.