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    Item type:Publication, Access status: without files ,
    Analyzing global passenger flows based on choice modeling in the air transportation system
    (Elsevier, 2024-03)
    Kölker, Katrin
    ;
    Lütjens, Klaus
    ;
    Gollnick, Volker
    Airline passenger decisions determine operation of airlines and aircraft. Therefore, global air transport models need to consider these decisions. Thereby, we develop a discrete choice model for passenger decisions describing global passenger flows based on different parameters. The model distinguishes between passenger itineraries defined by attributes like ticket price, travel time and number of transfers. Additional attributes are added gradually. It is estimated using schedule and passenger demand data. Hence, based on topological structures of the air transport system, global passenger flows and elasticities can be identified. Additionally, we provide quantified results describing the elasticity of several types of attributes, the values of travel time, the quality of travel and compare them for different regions, itineraries and travel types.
    Publicationtype: Journal Article
      44
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    From passenger itineraries to climate impact: Analyzing the implications of a new mid-range aircraft on the global air transportation system
    (2023-10)
    Kühlen, Markus
    ;
    Kölker, Katrin
    ;
    Linke, Florian
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    Dahlmann, Katrin
    ;
    Gollnick, Volker
    Aircraft design usually focuses on utilizing new technologies to improve mission performance of individual aircraft and, thus, reduce cost, emissions and climate impact of the global air transportation system (ATS). However, efficiency gains in the ATS can also be achieved by improving the alignment of payload–range capabilities and aircraft–route assignment of the overall fleet. Therefore, this article analyzes the implications—from passenger itineraries to climate impact—of a new mid-range aircraft (NMRA), which addresses the current lack of modern, designated mid-range aircraft in commercial production. The analysis is based on simulating and comparing two future scenarios with similar technology levels: one with and one without a NMRA. The core of the applied novel simulation framework is highly integrated models for passenger itinerary preferences, fleet development and aircraft–route assignment. Models for passenger demand as well as aircraft trajectories, emissions and climate impact complement the simulation framework. The results show that introducing a NMRA to the ATS improves the quality of travel for passengers and the alignment of payload–range capabilities and aircraft–route assignment for the overall aircraft fleet. As a consequence, the NMRA reduces the fuel consumption, emissions and climate impact of the ATS in our future scenarios by up to 1.4% (pessimistic) and 2.1% (optimistic). We conclude that a higher fleet diversification and a better alignment of payload–range capabilities and aircraft–route assignment through introducing a NMRA can marginally improve the fuel efficiency and climate impact of the ATS.
    Publicationtype: Journal Article
      22
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