The Brazilian 737 apparently collided with a biz jet over the Amazon
at 37,000 feet, a testimony to the accuracy of modern navigational
instruments.
Somebody screws up, and you exactly collide with conflicting aircraft,
over remote jungle.
I have never understood exact altitudes. In fact, I always added
220 feet. Never fly at a multiple of 500 feet. Stay out of high
density altitudes.
--
Ron Hardin
On the internet, nobody knows you're a jerk.