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If you want to run a mobile corridor to both the front and back cabin doors, if have to get past the wings in the middle.

Back in the days when people used to walk out to their planes and climb stairs, I think they did board using multiple doors. The old Boeing 727 actually had a staircase that lowered from the back of the fuselage under the tail, and I remember people used to enter and exit via that as well as the front.