Also a very frequent flier, with connections, I have seen a lot of different actions take place in support (or not) of connecting passengers.
What I have found with American Airlines, is their mainline flights will try and wait for connecting passengers. OTOH, American's regional airline(s) often do not care. These regional employees I suspect are treated as second class (not the aircrews), and it reflects in attitude.
I have great awareness of the thankless job all ground employees at a major airport. Just commuting to the airport is a hassle, then park and shuttle bus to the terminal, then security, all for a often low paying job. Nights, weekends, from gate agents to fast food employees-- a thankless job at many major US airports.
My last very frusting missed connection was DFW to LIT, last flight out to LIT that evening. I arrived at the LIT departure gate one minute after published boarding end time. Aircraft still at the gate, but ramp door closed and no Envoy Air (AA) agent at the desk. Tells me the agent could care less about connecting PAX, and likely closed the door early. I will let
@Just a civilian pilot , and
@Astro14 comment, but I suspect the last flight out on a regional jet, to a regional airport, could have waited for connecting PAX at least until the published door closing time.
In the gate agents' defense, they may not have thought I could move through DFW quick enough to make the connecting flight, and closed the door early as the rest of manifested passengers may have boarded.