WASHINGTON, Feb 5 (Reuters) - The Federal Aviation

Administration and National Transportation Safety Board plan to

brief senators Thursday on last week's midair collision between

an American Airlines ( AAL ) passenger jet and a military

helicopter near Washington Reagan National Airport that killed

67, a committee aide said.

In the aftermath of the crash, the FAA has imposed

significant restrictions on helicopter flights around Reagan

National until at least late February with exceptions for police

and medical helicopters, air defense and presidential air

transport. The FAA said in a notice posted Tuesday that civilian

airplanes may not fly in the area around Reagan airport when

helicopters are present.