Transportation
Army Helicopter Was Flying Above Limit Before Midair Collision
Emergency crews respond to the crash site along the Potomac River on Jan. 30.
Photographer: Tierney L. Cross/BloombergThis article is for subscribers only.
A US Army helicopter was flying higher than permitted limits when it collided in midair with an American Airlines Group Inc. regional jet last week, according to US aviation safety investigators.
The altitude of both aircraft are central issues to investigators working to unravel how the worst US civil aviation disaster in decades occurred, and how to prevent similar accidents from happening again.