The stub is really only needed to find your seat. It is far easier to deal with than people having to dig out phones, works for all passengers and countries et

The stub is really only needed to find your seat. It is far easier to deal with than people having to dig out phones, works for all passengers and countries etc. Whenever I am on a plane several passengers end up in the wrong seats and the stubs are used to resolve the issue quickly. On the identity side you already have to travel with identification and that can be used a lot of the time. Things can get complicated (eg being rebooked by another airline), lots of queues, many flights leaving at similar times where the stubs are helpful because people can be helped and processed a lot quicker. The stub is something that can be consistent between passengers whereas passports, drivers licenses and other forms of identification are all over the place.