Just the normal airport designs could be improved a lot, with no added technology. It doesn't take a genius to see how many airports have very long walking distances or oddly placed stairs etc.
Also, airlines for some reason don't want checked in luggage, since they price it so high. This means everyone travels with maximum hand luggage, and boarding takes a long time. The last people boarding usually can not find space in the overhead bin close to their seat. I wonder if they really are at the global optimum point with this.
Checked in luggage is also notoriously unreliable (it travels to the wrong country or is thrown around with such force that everything is broken) which can ruin your trip.
Also, airlines for some reason don't want checked in luggage, since they price it so high. This means everyone travels with maximum hand luggage, and boarding takes a long time. The last people boarding usually can not find space in the overhead bin close to their seat. I wonder if they really are at the global optimum point with this. Checked in luggage is also notoriously unreliable (it travels to the wrong country or is thrown around with such force that everything is broken) which can ruin your trip.