The Brief

WASHINGTON - The NTSB released new audio and surveillance video on Wednesday at the start of three days of investigative hearings into the midair collision at Reagan National Airport.

What we know:

An animation from the National Transportation Safety Board revealed the estimated altitudes of the CRJ-700 jet and helicopter were within just 10 feet — meaning the chopper was 80 feet above its 200-foot limit. Testimony said the error was potentially caused by an incorrect altimeter reading.

Also now known is that the Blackhawk’s ADS-B tracking was turned off — technology that allows planes and pilots to share locations in real time.

Audio from the DCA plane crash

Audio from the air traffic control tower was released Wednesday as well.

"I just saw a fireball and then it was j

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