#AviationSafety #HelicopterTraffic #NTSB
www.nbcnews.com
Deadly midair collision near D.C. followed years of ignored warnings about traffic, investigators say
WASHINGTON -- National Transportation Safety Board members were deeply troubled Tuesday over years of ignored warnings about helicopter traffic dangers and other problems, long before an American Airlines jet and an Army Black Hawk collided a year ago, killing 67 people near Washington, D.