Airline disruptions incurred huge cost for airlines and serious inconvenience for travelers. In this paper, we study the integrated aircraft and crew schedule recovery problem. A two stage heuristic algorithm for the integrated recovery problem is proposed. In the first stage, the integrated aircraft recovery and flight-rescheduling model with partial crew consideration is built. This model is ...

Airlines are continually faced with the challenge of efficient utilization of their cockpit crew resources. In addition to regular flying crews, some airlines have to maintain significant reserve staffing levels to meet contractual obligations and provide smooth daily operations. Reserve crews are required to cover trips remaining unassigned due to disruptions during daily operations. Airlines ...

UK has a large and complex passenger rail network divided into a number of franchises. Crew scheduling, one of the last stages of operations planning before services go live, is mission critical to the train operating companies, which would feel the pain of manual scheduling. As far as the author is aware, attempts by these companies to adopt an automatic optimizing train crew scheduling system...

The International Space Station is one the most complex projects ever, with numerous interdependent constraints affecting productivity and crew safety. This requires planning years before crew expeditions, and the use of sophisticated scheduling tools. Human work practices, however, are difficult to study and represent within traditional planning tools. We present an agent-based model and simul...

Trip generation is the most time-consuming phase of the crew scheduling process. A large number of trips must be constructed while satisfying a complex set of regulations. In this paper, we present an efficient trip generation method that utilizes effectively a legality checking system in order to reduce the corresponding search space. Special pruning rules are defined using a high-level rule l...

Singapore Mass Rapid Transit (SMRT) operates two train lines with 83 kilometers of track and 48 stations. A total of 77 trains are in operation during peak hours and 41 during off-peak hours. In this article we report on an optimization based approach to develop a computerized train-operator scheduling system that has been implemented at SMRT. The approach involves a bipartite matching algorith...

The technician routing and scheduling problem consists in routing and scheduling a crew of technicians in order to attend a set of service requests, subject to skill, tool, and spare part constraints. In this study we propose a formal definition of the problem and present a constructive heuristic and a large neighborhood search optimization algorithm.

A subgradient method for solving large linear programs is implemented and analyzed in a column generation framework. A performance comparison of the implementation is made versus the commercial linear programming solver XPress. Computational results from tests using data from airline crew scheduling, in particular crew rostering, show that the method performs very well in a column generation sc...