Endüstri Mühendisliği

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Browsing Endüstri Mühendisliği by Subject "Airlines -- Planning -- Mathematical models."

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    Effects of pricing and fleet structure on the airline fleet assignment problem
    (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2014., 2014.) Kalafatoğlu, Yasemin.; Bilgiç, Taner,
    The fleet assignment problem constitutes a significant part of airline costs, given that flight operating costs are directly related to it and the fleeting decision affects passenger revenues. The basic fleet assignment problem overlooks itinerary demands and revenue management. In this study, a mixed integer planning model for fleet assignment that incorporates itinerary-level demands, the Itinerary-based Fleet Assignment Model is solved, utilizing real data from a Turkish and a European airline. A multi-factorial experimental design is constructed to examine the interactions of itinerary-based fares, demand and fleet structure based on their effect on the fleet assignment decision. The design defines levels for each factor, representing a percent change in the fare and demand parameters, and different fleet compositions for the fleet structure. The model is solved to optimality for three datasets, for each level of the factors fare, demand and fleet structure. The results are analyzed by a statistical software with respect to different response variables and the effect of each factor to fleet assignment is investigated. Results indicate that fleeting contribution and passenger losses are strongly related to itinerary pricing, demand, and fleet structure.
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    Tactical competition of two airlines in fleet assignment
    (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.) Yaba, Ceyda.; Bilgiç, Taner,
    We analyze two airlines competing in the same market at a tactical level using an itinerary-based eet assignment model. The market demand is contingent on the fares chosen by the airlines. The airlines solve their own eet assignment models and can choose to spill customers on some itineraries. The recapture rates of these customers are also contingent on the fares chosen by airlines. Therefore, the dimensions of competition are both the demand and the recapture rates in the same market. Using a logit model for allocating the demand and the recapture rates between the airlines, we seek for equilibrium behavior of the airlines with exogenous fares in a computational setting. We argue that in this tactical level competition, variables like eet type, aircraft capacity is as important as the fares.