It would be good for all of the newbies at the regionals to understand and read this jumpseat guide. That being said I have had many mainline pilots in the back who never say a word to us up front in the rj's too. It goes both ways. There is no excuse for disregarding jumpseat etiquette but I dispense with the notion that a major pilot is less obligated to extend the same courtesy to a regional captain. Don't get me wrong, I wish I worked for a mainline operation but unfortunately they aren't hiring.