Okay.
In terms of 121 quality of life, the best schedule flexibility I ever had was at USAir. The ability to trip improve, split trips whenever you passed through domicile, drop trips for pay when they touch training or vacation were all just the best of all worlds.
Making the most money goes hands down to Southwest. Picking up out of domicile, flying up to FAR limits, flying during vacation. Lots of opportunities to fly more - but it's tougher to trade down or get rid of flying.
No schedule flexibility at WM, but you also didn't fly every day. It was kind of like being on reserve for your entire career with no work rules. It was great until we had a kid and needed a little schedule flexibility. If airline flying is 99% flying and 1% BS -- I feel like (at least for me) corporate was 1% flying and 99% BS.
Best training of the 3 was WM. Flight safety recurrent every six months. Never knew the airplane and its systems better over the long haul as I did when I was there.
Best initial training was USAir. The dug deep into the systems and spent time on the FMS. Granted that was a different era of training (pre AQP) but I just felt like you built the airplane from scratch in initial and really knew it well.
Standardization was best at USAir, Southwest is second except for during deicing, where SWA just has a superior methodology.
I'd like to see autoland at WN. Hopefully before I retire.
Flying corporate had the least standardization but due to the size of the department we generally knew what everyone's pet peeves were. I did my best to incorporate what I learned from 121 into the flying I did in corporate flying. Without dispatchers pilots had wide latitude to choose alternates and fuel loads. Sometimes it was easier than others to get the job done given the constraints of the airplane. You bend the rules from time to time, until you realize you're hanging your ATP out there every time you do.
All that said, my first love and the job I miss the most is USAir. WN is a close second.
Part 91 corporate was great during the lost decade. Best post 9/11 job I could've hoped for considering many of my friends were leaving aviation or working for dirtbag operators around the world. My only regret was that I should've gone back to the airline when I had the opportunity. With a young baby at home and facing an untenable commute, I made a different choice and it turned out to be the wrong choice.
Hope that answers some of your questions.
