Eli5 – How do the USA test top secret aircrafts such as the B-21?

Question

I’m pretty sure the U.S. revealed the B -21 bomber because they have other top secret aircrafts that make the B-21 look like childs play. I don’t think we would reveal anything that would give competitive information to enemy countries. Based on those logic, how do we test out to secret aircrafts without getting caught on satellite cameras from other countries???

In: 15

Answer 1

There are huge facilities in the southern California desert specifically dedicated to this task. They’ve been in use for At least 70 years. Also, nighttime darkness is a thing. And NORAD knows where all surveillance satellites are.