Of Berlin's three airports, Tegel has the most scheduled flights. As part of a project for Deutsche Flugsicherung (DFS) that also covered the airports of Frankfurt, München, and Hannover, HITT supplied the A-SMGCS. All four systems are characterised by a very high level of availability and duplication of essential equipment, with a particular emphasis on the data links. The system automatically calculates the ATD and ATA of departing and arriving airplanes.