An industry analysis done in 2009 based on a study revealed that the global MRO inventory held by the commercial aviation sector was USD 47 billion, where the MRO supply chain spend totalled USD 45.7 billion.
That MRO supply chain spend, scaled up to USD 60.7 billion in 2013. This indicated that components and material roughly accounted for 50% of a commercial airline’s direct MRO cost.