The Stillsands is the sixth Black Box collectable in Horizon Forbidden West.
Transcript[]
CAPTAIN BUCHANAN: Copy that. We'll have the cargo on the ground on schedule. Over.
I can't believe how responsive this plane is. 240 feet long, 700,000 pounds on takeoff and it turns faster than my 12-seater puddle hopper. Plus they only wheeled it back out of a museum a few months ago. Hah. Hell of a way to tick this beauty off my bucket list.
Location[]
Found in the Stillsands among the aircraft wreckage, near the Salvage Contractor. It cannot be accessed until the Vine Cutter is obtained.