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Direct operating cost is a design driver because

  • A.It is set by regulation
  • B.It fixes the certification basis
  • C.Airlines buy on operating economics
  • D.It determines the structural material

Answer: C

Fuel burn, maintenance, crew and ownership together decide whether an aircraft earns its operator money over decades. A design that is cheaper to buy but costlier per seat-mile generally loses, which is why fuel efficiency dominates modern transport design.

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