Regional Airlines. Skywest/Chautququa=United Express, Delta Connections, etc? Please Explain?

Please help me understand how Skywest Airlines and Chautauqua Airlines are also United Express, Delta Connections, etc.? Which one is better? If I wanted to fly for Express/Connections would I interview through Skywest/Chautauqua or Delta/United. I don't get it. Are the salaries the same for all of them? If so,... show more Please help me understand how Skywest Airlines and Chautauqua Airlines are also United Express, Delta Connections, etc.? Which one is better? If I wanted to fly for Express/Connections would I interview through Skywest/Chautauqua or Delta/United. I don't get it. Are the salaries the same for all of them? If so, what are the salaries.
Also, when you get hired by an airline, do you get to choose Boeing vs Airbus, or at least a preference?
And lastley, if I went to college and while in college got my Commercial twin engine instrument, what jet training school should I go to?
Thanks!
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