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Their gate might be occupied by a flight that can't leave.
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This seems like one of those efficiency-vs-resilience problems. Sure, it's "more efficient" (in cost) to use the same empty/fill process for every plane, but when nobody can leave, some extra capacity to unload planes would help.

(i.e. Unloading to tarmac, buses)

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You don't have to go to a gate to deplane and this is an extremely rare event. They'll just pull up a staircase and have them deplane to a shuttle eventually.
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Most U.S. airports aren't equipped to deplane commercial airliners using stairs, especially at this scale.
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You empty the planes at the gates and then push them back to parking (or park them on the runway if needed).
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O’Hare is under construction. They’re building an entire new terminal and are operating with a lot less spare capacity while that happens.
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Not to mention they won't have enough staff to operate the gate equipment for all gates at once.
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We are 6th in line waiting for a gate while they tow grounded planes off of the gates. Normally those flights would have departed and we would get a gate fairly quickly, but if no one is taking off, then they need to move them, and potentially deplane the (angry) departing passengers.
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The only time I've spent long stretches on a grounded plane have been at ORD. It's such a busy airport than any disruption to the schedule just causes all sorts of chaos.
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waiting on the stairs since all the gates are full
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not enough gates
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Standard protocol. Doesn’t matter what the issue is, you follow it
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Doesn’t mean you wouldn’t still want to know why.
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