The PHARE program conducted experiments from 1989-1999 to demonstrate an integrated air/ground air traffic management system using advanced tools and interfaces. It involved developing tools to address issues like aircraft navigation capabilities, air traffic controller automation support, and human-machine interfaces. Large-scale real-time simulations examined topics like trajectory prediction, arrival/departure management, and air/ground negotiation. The experiments concluded the concept could increase capacity and reduce controller workload but further studies were still needed on tools like negotiation managers and impact of meteorological forecasting.