Recent advances in aviation technology have led to the realization of a per-seat, on-demand (PSOD) air transportation business that operates without a published flight schedule. A major decision problem this business faces is planning the scheduled maintenance which is required to ensure safe and efficient operations. This paper addresses both tactical and operational planning pertaining to this problem. At the tactical level, it determines the daily maintenance capacities. As the fleet size grows over time, decisions pertaining to when and how much to increase maintenance capacity are made. At the operational level, it assigns itineraries to jets and determine the jets to be maintained on a daily basis. It also embeds operational maintenance planning into a framework, capturing the interaction maintenance decisions and daily flight scheduling. (15 refs.)
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