The constant increase in air traffic, since the beginning of the commercial aviation, has led to problems of saturation on airports, approaching areas, or higher airspace.Whereas the aircraft are largely optimized and automated, the air traffic control is still essentially relying on human experience. The present case study details two problems of air traffic management (ATM) for which a genetic algorithm based solution has been proposed. The first application deals with the en route conflict resolution problem. The second application deals with the traffic management problem in an airport platform.