“BagStage” is a software combination bag of SAC (Sorting Allocation Computer) system. “BagStage” is based on a distributed architecture that intrinsically provides redundancy and scalability. This architecture includes an “on the fly” data replication mechanism that automatically ensures a complete synchronization of dataamong the different machines composing the system. This system is composed of various building blocks that can be used separately or combined to create a powerful system fully tailored to each airport specific needs.