According to a recent report by Aerostrategy Management Consulting, spending by air transport maintenance and repair organizations (MROs) worldwide totaled 40.8 billion dollars (USD) in 2006. Moreover, Aerostrategy (Ann Arbor, Mich, and Amersham, Buckinghamshire, U.K.) reports that spending on air transport maintenance materials alone was 16 billion dollars and is likely to increase to 20 billion dollars by 2011. More than 50 percent of those material funds go to engine maintenance and repair. Smaller portions are spent on the rest of the aircraft - 14 percent for airframe structures and 21 percent for other aircraft components. Today, composites account for a fraction of that.
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