Definition of Unit Fly-away Cost Used by DOD:
The standard definition of aircraft unit fly-away cost is found in the DOD Financial Management Regulations. Standard unit flyaway cost elements include the costs of procuring airframes; engines; avionics; armaments; engineering change orders; nonrecurring costs including production tooling, software, and other costs (if funded from aircraft procurement appropriations); divided by the procurement quantity.
Flyaway cost does not include research and development, support equipment, training equipment, technical data, or spares.