As he flew downtown, he and his pilot saw a second jetliner that was out of place, moving fast and abrupt.
As he looked back out his window through his camera monitor, he saw the second plane make an impact with the second tower.
RELATED | 'Eyewitness to 9/11: Behind the Lens' reveals untold stories, rare video of America's darkest day
'Eyewitness to 9/11: Behind the Lens' | Full Special
That moment is when he knew this wasn't an accident.
Watch his never-before-heard story from the skies.
CLICK HERE for more Eyewitness News reflections, photos and stories marking the anniversary of 9/11
----------
* Get Eyewitness News Delivered
* Follow us on YouTube
* More local news
* Send us a news tip
* Download the abc7NY app for breaking news alerts