Originally Posted by dojetdriver

I'm guessing that is has NOTHING to do with the cockpit JS. There are lots of airlines that allow their FA's to "Jumpseat" on their own airline. SOME airlines allow other airline FA's to JS on them. They are allowed to occupy the FA's JS. Now, I don't know about MESA's ERJ's, but the aircraft does have an aft FA JS that our FA's are allowed to occupy if the flight is full.

Also, depending on how the non rev agreement is structured, you can be charged a fee to non rev, even on your own airline. If using the JS, it won't cost the anything.