[josephcsible]

One idea I'm surprised that I've never seen tried is assigned slots in the overhead bins. That would avoid the problem of two-way traffic in the aisle caused by people putting their bags in bins further back than their seat, plus remove most of the incentive for passengers to try to board before they're supposed to.

[_tqr3]

Sounds like logistical nightmare.

How do you keep track of bin space while accounting for variable luggage sizes and compliance?

[josephcsible]

Put physical dividers in the overhead bins so that oversize luggage won't fit at all and has to be gate-checked.

[_tqr3]

The main disadvantages are that physical dividers add weight and require maintenance. Also, they reduce flexibility, preventing the ability to tetris more bags into a bin.

[josephcsible]

Sure, but I suspect that the savings in reduced turnaround times could be enough to offset those things.