I disagree bigtime. Every legacy runs their operation differently. You can definitely get a feel for their day-to-day operations, even at the regional level. This includes how they treat commuting or nonrev crews, ground handling, procedures, passenger treatment, even something as small as the everyday word of mouth from the different mainline employees can give you more insight into their ops. Of course this doesn't mean you'll get a feel for what it's like to be a mainline employee at that airline. I understood what LUPilot was trying to say.