Originally Posted by
zig666
Well, but on smaller planes like CRJs which can't be reached from the jetbridge once the little ramp is removed, the doors are closed by the FA as well - so a 757 Door is different in a way it can't be securely closed from the inside?
Very different comparison between the 757 and a CRJ. The CRJ (and other regional planes) were designed to be self-loadable from the ground, with the built-in airstairs, etc. The 757 requires a boarding platform (be it a jetway, airstairs, etc.) to load/unload.