The news of the disciplinary action against the controllers came as new amateur video emerged showing the collision between the helicopter and the plane. Investigators had been searching for such footage to aid in their investigation of the accident.
Nance said that the video, taken by a tourist on a boat in the Hudson, shows "two pilots that simply couldn't see each other" because of blind spots.
"Neither of them had any idea the other was there," he said. "It's very, very seldom in aviation safety that we have such graphic representation of what happened."
In the wake of the accident, critics are calling for more restrictions for flights within the crowded Hudson River corridor.
In that area over the river, aircraft flying below 1,100 feet are virtually on their own, with no air traffic controllers guiding them in the crowded airspace. National Transportation Safety Board chairwoman Deborah Hersman said it's the responsibility of pilots "to see and be seen and be aware of traffic around them."
It's also a busy space: The area saw 225 flights every day in the week prior to the accident, investigators said.
"It is unconscionable that the FAA permits unregulated flights in a crowded airspace in a major metropolitan area," said Rep. Jerrold Nadler, D-N.Y., who serves on the House Transportation and Infrastructure Committee. "And it is ridiculous that private planes and helicopters flying through a crowded area are dependent, while in flight, on visually sighting other aircraft and communicating with them. The real-life repercussions of these non-existent regulations have been disastrous."
The "'see and avoid' concept is really bankrupt," Nance said. "Something needs to be done."
ABC News' Lisa Stark and Kate Barrett contributed to this report.