Originally Posted by FlyJSH

Actually, not all regionals are the same.

There are some regionals which provide connection to a mainline in aircraft the mainline could not afford to support: light twin and turbo prop operators.

Then there are some regoionals which have both augmented and eroded mainline operations: the RJ operators.

Then there is a third group of regionals which circumvent all mainlines, regionals, and unions......