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Development of a codeshare flight-profitability system at Delta Air Lines
O'Neal, Jerome W., (2007)
SPECIAL SECTION: WAGNER PRIZE PAPERS - Delta Optimizes Continuing-Qualification-Training Schedules for Pilots - Airlines must schedule pilots for periodical training if they are to maintain flight qualifications, and Delta expects to save (USD)7.5 million annually by using CQOPT to schedule training.
Sohoni, Milind G., (2003)