It has been tried and simulated And wargamed. Southwest has tried the “simultaneous front and back loading” as well.
the issue is this in reality there isn’t much difference. *If* everyone acts as automatons then you can get really efficient loading times using load methods like “load back to front, Seat D. Then load back to front Seat C, then load back to front seat A, then load back to front seat B”
the problem is humans are not automatons and do things like get out of line, or want to argue with the stewardess, or want to negotiate a different seat during loading, or want to get a “better” overhead bin, or they need to pet someone’s dog or complain about a screaming child, or they don’t get out of the aisle immediately when they find their seat, they need to push back upstream to go to the bathroom, someone needs help being seated (airlines tend to get these people down the ramp first)
All of these things back up everyone behind them have to stop and wait. And this stops the entire boarding process every time anyone does any of the things I noted above (and about a zillion other ones). The problem isn’t the chosen process, it is all the other things humans do that disrupt and slow down the loading.
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