Senator Ted Cruz told reporters that the chopper's Automatic Dependent Surveillance-Broadcast (ADS-B) system was not on before the crash over the Potomac River in Washington, D.C.

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