I do a fair amount of JSing, and I've only been asked for my passport once in the past 15 months.
I keep my passport in the chest pocket of the uniform shirt I'm wearing, and I keep my license and medical inside my passport. That way, all three are available if the gate agent or CA want to take a look at any or all.
On another note, I would have expected a thread like this to be shut down for giving away security information online.