A long list of things went wrong in January and contributed to the collision between an Army helicopter and an American Airlines jet over Washington, D.

Aviation experts told the National Transportation Safety Board that night vision goggles may have created viewing difficulties for the pilots of a U.S. Army helicopter that collided with a passenger jet over Washington in January.

A Federal Aviation Administration official says the main communication lines went down in Denver earlier this week but radar remained online.

Sen. Ted Cruz asked whether a hotline between military and civilian air traffic controllers in Washington, D.