i-acs FDP (Flight Data Processing) is also available in an adapted version for national Flight Planning Centres, FPC, for the planning and realisation of air travel both nationally and internationally. The FDP system is specially developed to handle a large quantity of flight plans, from several clients and servers with high redundancy and availability. Great importance has also been placed on the design of the user interface in order to achieve a secure and user-friendly interface that eases and reduces the workload at peak periods.