I want to be careful how I word this, I am not trying to compare mesa with GJ, but it is not a secret that a lot of people don't like mesa. So what does mesa do? They welcome jumpseaters. You never hear of anyone getting denied by a Mesa crew. I have to ride them alot and they are always the most friendly and welcoming crews I run into. I have never heard anything other than, "Welcome aboard, glad to have you, make yourself at home." Maybe GJ needs to take a lesson from them, and try to build some respect (however little it may be) wherever they can. I can't believe GJ pilots would do this and only make it harder for their fellow pilots than it already may be.