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2. A. E. E. Eltoukhy, F. T. S. Chan, S. H. Chung, Airline schedule
3. L. Cadarso, R. de Celis, Integrated airline
4. S. Lan, J. P. Clarke, C. Barnhart, Planning for robust airline
5. M. Dunbar, G. Froyland, C. L. Wu, Robust airline schedule