I too have worked both 121, 135 and 91. I have operated my own two aircraft flight department Part 91 and I have to say the level of proffessionalism I believe should be upheld in the aviation/pilot community is equal among the all types of pilots (91,121,135). I have also met pilots in all three world which I am embarrassed to say share the same profession as I do. There were some guys at Business Express that were complete nightmares and also some guys in the 135/91 world that make Charles Manson look like a choir boy. That is the human nature side of what we do and a true professional deals with all personality types and operates as safe and effeciantly as he can with what he has to work with. The point is that professional pilots need to be helping each other out not stabing each other in the back. As for the union non union comparison I have to say I like non union more. I believe that I am strong enough in the cockpit and with my negotiating skills to better my self well beyond what a union can/has. I also believe the greatest aspect of union pilot group is that the union saves pilots from there piers more then management (although managemnet sounds like a nightmare if you only read APC). Good luck to all.