Modifying lines-of-flight in the planning process for improved maintenance robustness

As a part of their planning process, airlines construct lines-of-flight ( LOFs ) – daily repeating sequences of flights, each of which will be flown by a single aircraft. In the week leading up to the actual day-of-operations, these LOFs are then assigned to specific aircraft ( tails), forming multi...

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Published in:	Computers & operations research Vol. 39; no. 9; pp. 2051 - 2062
Main Authors:	Lapp, Marcial, Cohn, Amy
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01.09.2012 Elsevier Pergamon Press Inc
Subjects:	Air transportation and traffic Aircraft Aircraft components Aircraft maintenance Airline planning Airline scheduling Applied sciences Deviation Disruption Exact sciences and technology Ground, air and sea transportation, marine construction Maintenance Mathematical programming Operations research Repair & maintenance Robustness Scheduling Studies United States > US Airline planning Robustness Aircraft maintenance Process planning Flight Routing Scheduling Maintenance Reachability Airplane Air transportation Overhead line Metric Planning Incomplete information Aircraft Mathematical programming
ISSN:	0305-0548, 1873-765X, 0305-0548
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Abstract	As a part of their planning process, airlines construct lines-of-flight ( LOFs ) – daily repeating sequences of flights, each of which will be flown by a single aircraft. In the week leading up to the actual day-of-operations, these LOFs are then assigned to specific aircraft ( tails), forming multi-day aircraft routings that in turn enable the scheduling of routine maintenance checks. Operational disruptions, however, can lead to deviations from these routings, which in turn disrupt the maintenance plan. The goal of our research is to improve the construction of LOFs so as to increase the likelihood of being able to recover from maintenance disruptions without costly over-the-day aircraft swaps. We present a new metric, maintenance reachability ( MR), which measures the robustness of a planned set of LOFs, and develop a mathematical programming approach to improving the MR of a given set of LOFs. We provide computational results based on data from a major U.S. carrier demonstrating that significant improvements in MR can be achieved with only a small number of changes to the original set of LOFs. Finally, we conclude by showing that even under imperfect input data, MR can be improved relative to a planned set of LOFs.
AbstractList	As a part of their planning process, airlines construct lines-of-flight (LOFs ) - daily repeating sequences of flights, each of which will be flown by a single aircraft. In the week leading up to the actual day-of-operations, these LOFs are then assigned to specific aircraft (tails), forming multi-day aircraft routings that in turn enable the scheduling of routine maintenance checks. Operational disruptions, however, can lead to deviations from these routings, which in turn disrupt the maintenance plan. The goal of our research is to improve the construction of LOFs so as to increase the likelihood of being able to recover from maintenance disruptions without costly over-the-day aircraft swaps. We present a new metric, maintenance reachability (MR), which measures the robustness of a planned set of LOFs, and develop a mathematical programming approach to improving the MR of a given set of LOFs. We provide computational results based on data from a major U.S. carrier demonstrating that significant improvements in MR can be achieved with only a small number of changes to the original set of LOFs. Finally, we conclude by showing that even under imperfect input data, MR can be improved relative to a planned set of LOFs. As a part of their planning process, airlines construct lines-of-flight ( LOFs ) – daily repeating sequences of flights, each of which will be flown by a single aircraft. In the week leading up to the actual day-of-operations, these LOFs are then assigned to specific aircraft ( tails), forming multi-day aircraft routings that in turn enable the scheduling of routine maintenance checks. Operational disruptions, however, can lead to deviations from these routings, which in turn disrupt the maintenance plan. The goal of our research is to improve the construction of LOFs so as to increase the likelihood of being able to recover from maintenance disruptions without costly over-the-day aircraft swaps. We present a new metric, maintenance reachability ( MR), which measures the robustness of a planned set of LOFs, and develop a mathematical programming approach to improving the MR of a given set of LOFs. We provide computational results based on data from a major U.S. carrier demonstrating that significant improvements in MR can be achieved with only a small number of changes to the original set of LOFs. Finally, we conclude by showing that even under imperfect input data, MR can be improved relative to a planned set of LOFs. As a part of their planning process, airlines construct lines-of-flight (LOFs ) -- daily repeating sequences of flights, each of which will be flown by a single aircraft. In the week leading up to the actual day-of-operations, these LOFs are then assigned to specific aircraft (tails), forming multi-day aircraft routings that in turn enable the scheduling of routine maintenance checks. Operational disruptions, however, can lead to deviations from these routings, which in turn disrupt the maintenance plan. The goal of our research is to improve the construction of LOFs so as to increase the likelihood of being able to recover from maintenance disruptions without costly over-the-day aircraft swaps. We present a new metric, maintenance reachability (MR), which measures the robustness of a planned set of LOFs, and develop a mathematical programming approach to improving the MR of a given set of LOFs. We provide computational results based on data from a major U.S. carrier demonstrating that significant improvements in MR can be achieved with only a small number of changes to the original set of LOFs. Finally, we conclude by showing that even under imperfect input data, MR can be improved relative to a planned set of LOFs. [PUBLICATION ABSTRACT]
Author	Lapp, Marcial Cohn, Amy
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Snippet	As a part of their planning process, airlines construct lines-of-flight ( LOFs ) – daily repeating sequences of flights, each of which will be flown by a... As a part of their planning process, airlines construct lines-of-flight (LOFs ) -- daily repeating sequences of flights, each of which will be flown by a... As a part of their planning process, airlines construct lines-of-flight (LOFs ) - daily repeating sequences of flights, each of which will be flown by a single...
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SubjectTerms	Air transportation and traffic Aircraft Aircraft components Aircraft maintenance Airline planning Airline scheduling Applied sciences Deviation Disruption Exact sciences and technology Ground, air and sea transportation, marine construction Maintenance Mathematical programming Operations research Repair & maintenance Robustness Scheduling Studies
Title	Modifying lines-of-flight in the planning process for improved maintenance robustness
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