To process the checkin,
-at least one checkin agent; more if many passengers are expected and excessive queues are to be avoided;
-the required equipment; i. e. computer systems and desks;
-sufficient space for all the passengers to queue up in front of those desks; and we are talking about three-figure numbers.
We would completely eliminate the boarding scan and all those queues, as they would happen when you check in to the gate. Today we queue 4 to 5 times - check in, baggage drop, security, immigration/customs and finally boarding. You would save man hours by reducing that down to 1 queue for all of it, I'm sure of that. The equipment could be mobile or portable and the space problem is just a design matter. Not all flights are A380s - we're talking 100 people here, same as you see at any gate. What would the difference be - they're queueing in front of the gate waiting to board today as well, no difference.