Hundreds of families are in mourning after an American Airlines regional jet collided with a U.S. Army Black Hawk helicopter on Wednesday night, with both aircraft plunging into the Potomac River near Washington,

An American Airlines regional jet went down in the Potomac River near Ronald Reagan Washington National Airport after colliding with a U.S. Army Black Hawk helicopter, Wednesday night, prompting a multi-agency search-and-rescue operation, according to officials.

As work resumes Tuesday, the US Army Corps of Engineers said they are actually ahead of schedule and plan to focus on recovering the passenger jet’s cockpit. Right now, the number of victims recovered still stands at 55 of the 67 positively identified.

Wind gusts and tidal conditions could slow recovery operations today after the midair collision of a passenger plane and helicopter last week.

Salvage crews have recovered an engine and large pieces of fuselage and are working to retrieve a wing from wreckage of last week’s midair collision near Washington’s Reagan National Airport

Black boxes from both the airplane and helicopter involved in last week’s deadly crash have been recovered by the NTSB as salvage crews continue to pull the wreckage from the Potomac River. NBC News Correspondent Aaron Gilchrist reports from Arlington,

Crews lift first wreckage from DC plane crash out of the Potomac River as recovery efforts continue. More aircraft parts will be removed to aid the search for victims