Those fears materialised Wednesday night when an American Airlines plane collided with a military helicopter, killing 67 people including three soldiers and more than a dozen figure skaters

As investigators try to uncover what happened when an airplane and a helicopter collided over the Potomac River, here is the latest information.

Jonathan Koziol, a retired Army chief warrant officer with more than 30 years of flight experience, told reporters that the flight was a nighttime qualification flight with an instructor pilot evaluating an experienced pilot on the flight routes that their unit routinely flies day and night around the Potomac River.