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cost × 86commercial-aviation × 13
airline-operations × 13
fuel × 10
general-aviation × 8
flight-training × 7
usa × 7
airliner × 6
aircraft-design × 5
aircraft-maintenance × 5
commercial-operations × 5
airlines × 5
low-cost-carrier × 4
efficiency × 3
economics × 3
flight-school × 3
safety × 2
aircraft-performance × 2
helicopter × 2
airport × 2
avionics × 2
flight-planning × 2
jet × 2
passenger × 2
ppl × 2
