Marginal crew costs
|Term||marginal crew costs|
the cost of crewing for additional minutes over and above those planned at the strategic phase.
University of Westminster (2008) Innovative Cooperative Actions of R&D in EUROCONTROL Programme CARE INO III, Dynamic Cost Indexing 
Marginal crew costs are appropriate for the cost index context. [...] These costs are derived from a detailed examination of payment mechanisms for aircraft crew, with reference to current salary ranges. (same source)
Lexicon Release 2015.2