Comment by tialaramex

And all Military air forces AFAIK. The military of course also takes rank very seriously, but there was existing understanding that Mother Nature doesn't give a shit about rank and so CRM makes sense in that same practical vein.

Also, you'll see that says "Crew" not just "Cockpit". Turns out that from the cockpit of an airliner you've not always got the best possible view of the problem. If the steward who has no idea how to fly a plane insists it's the right engine that is on fire, her input is valuable, from back where she's serving customers with coffee she can see the engines, the fire is on the right, whereas you're just looking at sensor outputs and you were maybe about to turn off the left engine.