Every airliner you board probably runs on a strict maintenance clock. Regulators require checks after set amounts of flying time or takeoffs and landings, and only certified workshops and technicians may do the work. AAR Corp works inside that routine. It supplies certified spare parts, repairs and services aircraft, and sells software that plans maintenance and orders parts. Its customers are airlines and government and defense buyers. Because maintenance follows that clock, demand for its work rises and falls with how much aircraft fly.
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