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scheduling problems. Nonetheless, significant challenges and opportunities remain. Two important areas of ongoing and future research are: 1. Integrated schedule planning: Although practical, the sequential nature of aircraft and crew schedule optimization leads to suboptimal plans, with potentially significant economic losses. As discussed in this chapter, improved plans can be generated by building and solving integrated models of some (and eventually all) of these sched- ule design, fleet assignment, maintenance routing and crew scheduling subproblems. Another area of integration is to expand schedule planning models to include pricing, revenue management decisions and competition. By integrating scheduling models (which are effective at minimizing operating costs) with pricing, revenue management and competition models (which are effective at maximizing revenues), schedules with improved overall profitability should result. 2. Operations recovery and robustness: The schedule planning and optimization pro- cesses at airlines produce plans that are rarely, if ever, executed. During operation of the schedule on any given day, disruptions caused by mechanical failures, crew illness and adverse weather conditions result in the need to replan and create recovery plans in response to these disruptions. Creating these responses is particularly challenging, with the need to develop feasible and cost-effective plans in a short period of time, often within minutes. As a complement to research on recovery planning, some researchers have focused on developing robust plans that are both more resilient to disruptions (allowing less frequent replanning) and easier to repair when replanning is necessary. Current research on robust schedule optimization attempts to achieve robustness by isolating causes of disruption and the resulting downstream effects, or by reallocating slack time in the schedule to where it is most needed. Much of the work to date, how- ever, focuses on the recovery or robustness of a particular resource, namely aircraft or crews. Disruptions, however, typically affect multiple resources. Hence, the challenge moving forward is to enhance current capabilities to generate integrated passenger, crew and aircraft recovery decisions and robust plans, and to evaluate these new plans and recovery policies using simulation and optimization tools.

airfare-schedules-42 (last edited 2009-08-23 18:54:37 by airfare-schedules-42)