This article presents the design and implementation of an air-crew assignment system, for producing and refining a solution to this problem, based on the artificial intelligence principles and techniques of abductive reasoning as captured by the framework of abductive logic programming (ALP). The system offers a high level of flexibility in addressing both the tasks of crew scheduling and rescheduling. It can be used to generate a valid and good quality initial solution and then help the human operators adjust and refine further this solution in order to meet extra requirements of the problem.
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