They do not need complete flight logs but they need filtered event logs especially landings and takeoffs at their site. As a first step we have implemented a data download into an excel sheet. This solution is currently run at EDRT but works for any airfield. The resulting spread sheet contains eventlogs like BlockOff, Taxistart, Taxistop, Takeoff, Landing, Hardlanding, BlockOn. It includes Timestamps by the second, Plane Ids and Pilot Ids. If the pilot keeps an account with the airport, then based on this ID a name resolution can be done for billing. In the near future we expect a seamless integration into airport ERP systems.