Network connectivity in airports can be patchy at best, and connectivity from the airport internal network to the internet even worse. All the check-in and boar

Network connectivity in airports can be patchy at best, and connectivity from the airport internal network to the internet even worse. All the check-in and boarding systems are designed to be able to work offline (with semi-automatic reconciliation afterwards). You have to query the no-fly list at check-in and boarding, so it's more resilient to have a list that can be loaded airport-side every morning