https://www.cbsnews.com/news/experts-ask-why-black-hawk-helicopter-may-have-been-flying-above-allowed-altitude/
"CBS News' review of the NASA safety data identified at least nine near midair collisions at the airport since 2005, including three involving helicopters.
"They're military pilots; they're familiar with the routes," Feith said. "Why is it on this day, on that flight, they were [as much as] 150 to 200 feet higher than they knew they should be?"
