Abstract: To make full use of airport terminal area capability and reduce flight delay,capacity utilization and flow assignment were optimized collaboratively.A model for collaborative optimization of capacity utilization and flow assignment was proposed.In the model,arrival and departure are considered to be two interdependent processes,the capacity in the airport terminal area is taken as the constraint,and the objective is to minimize the total delay of all arrival and departure flights.The model contains a delay cost priority coefficient to describe the preferences of airlines.A genetic algorithm was designed to solve the proposed model.A simulation example shows that the proposed model can optimize the capacity utilization and flow assignment synchronously,with the preferences of airlines being considered,and the genetic algorithm works well.