On a domestic airway? No clue about Brazilian air/route network or if it's allowed. They were over land, not the water. Don't know if they SLOP over land?
Agreed. And having heard the CVR from the Embraer, those two were literally flying around like clueless folks, completely distracted, and no care in the world that no one had contacted them. It wasn't until the CA stepped out to take a bathroom break did the FO finally think maybe I should contact someone by radio, it's been silent. And hearing him talk to ATC in his fast paced (normal) voice showed just how out of touch he was for the airspace he was in. And sorry, but TCAS being on stantby is visible on your MFD and a half decent scan should have picked that up within 20 minutes.
I know Brazilian ATC gets the main blame, but these two Embraer pilots were severely lacking in common sense airmanship.