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fuel × 273jet-engine × 35
fuel-systems × 23
fuel-tanks × 20
commercial-aviation × 17
aircraft-design × 16
engine × 13
flight-planning × 13
efficiency × 13
refueling × 12
safety × 11
airliner × 11
general-aviation × 11
cost × 11
aircraft-performance × 10
avgas × 10
piston-engine × 9
military × 8
airport × 8
aircraft-maintenance × 8
airline-operations × 7
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weight-and-balance × 7
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