WFF (Competitive Airport) was a joint undertaking involving 14 partners within the scope of the fourth aviation research program of the Federal Ministry of Economics and Technology. The partners were ADB, ATRiCS, delair, Lufthansa, DLR, DFS, DIEHL, FCS, Fraport, Hamburg Airport, iAd, Human Factors Consult, JEPPESEN and THALES.
In the sub-projekt Roll:MOPS for the first time a full range of „Follow-The-Green“ systems and procedures have been validated in simulation at the DLR Air Traffic Validation Center and in field trials at Frankfurt Airport (FRA) in 2009.