Kenny you have obviously done very well by getting into United at the start of first airlines golden age of the 21st century. I would be interested in hearing what you have to say after the next 5 years. I have never operated in the US but there is plenty of information about the US system. I reckon this bloke had a good idea of a career in the US: "Since September 11 2001, the airline industry has been ailing, and as a result of cutbacks, I've lost 40 percent of my salary. Meanwhile, the US Airways pension I thought I could count on was terminated in 2004, and a government-backed replacement plan is a very weak substitute."
So make hay while the sunshines, as history shows that you will face lean times and many disruptions in your career with United.