I think the best lesson they could teach the airlines is this. Make it MANDATORY that they show up at the airport two hours prior to departure time. Get rid of the whole SLF concept and start putting the passengers in containers. More efficient.
Of course, they would have to rework the schedules for connections to allow for removal from one container and being placed into another. But those are just small logistical detail that could be worked out later.
No matter where they are going, they could get you there by 12 noon the next day.