As noted above, we do this because the AFCAIG process uses this approach as well.
Within organic DMAG expenditures, we looked at total repair costs, which are what the AFCAIG process emphasizes in its treatment of variable costs.
We see no evidence of a consistent, cross-system relationship between fleet flying hours and DMAG expenditures in accord with use of AFCAIG flying-hour factors for short-run budgeting purposes.