WASHINGTON, Feb 2 (Reuters) - Officials have positively

identified 55 of the 67 people killed in Wednesday's midair

collision between an American Airlines ( AAL ) passenger jet and

a military helicopter over the Potomac River, Washington, DC

Fire Chief John Donnelly said on Sunday.

The Army Corps of Engineers is surveying and preparing to

begin significant salvage operations on Monday to remove the

wreckage from the river.

Wreckage is being moved to a hangar at Washington Reagan

National Airport. Much of the Potomac River remains off limits

to all vessels except authorized boats.