Airlift Hub-and-Spoke Location-Routing Model with Time Windows: Case Study of the CONUS-to-Korea Airlift Problem
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Airlift Hub-and-Spoke Location-Routing Model with Time Windows: Case Study of the CONUS-to-Korea Airlift Problem

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    Traditionally, the United States Air Force's Air Mobility Command (AMC) has used the concept of direct delivery to airlift cargo and passengers from a point of embarkation to a point of debarkation. While this method of one onload and one offload for each cargo load makes cargo tracking, or in-transit visibility (ITV), easy, and makes deliveries quickly, it appears direct delivery has significant disadvantages in many airlift scenarios. This study develops an alternative military airlift method utilizing concepts from the hub-and-spoke configuration used in the commercial airline industry. The goals of this project are two-fold: to develop an alternative hub-and-spoke combined location routing mixed integer programming prototype model, and then to use this model to determine what advantages a hub-and-spoke system offers, and in which scenarios it is best-suited, when compared to the direct delivery method. Three types of bases are incorporated into the model: supply bases (hubs for the line-haul aircraft), transshipment bases (hubs for the local-delivery aircraft), and destination ( demand) bases. The model features the following elements: time windows, cargo tracking capability, multiple frequency servicing, aircraft basing assignments and routing, and the selection of the optimal number of local-delivery aircraft to be used. The model incorporates ideas from the following works: the hierarchical model of Perl and Daskin (1983), time windows features of Chan (1991), combining subtour-breaking and range constraints (Kulkarni and Bhave, 1985) and multiple servicing frequency via the X clustering co-location method for binary variables (Baker, 1991). Additionally, an original approach for cargo tracking is developed and incorporated. As a case study, the CONUS-to-Korea transoceanic airlift problem is used to test the model.
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