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fuel-tanks × 102fuel × 25
fuel-systems × 23
aircraft-design × 21
safety × 8
wing × 7
military × 4
airliner × 4
aircraft-maintenance × 4
aircraft-systems × 4
airbus-a320 × 4
fighter × 4
airbus-a380 × 4
refueling × 4
aviation-history × 3
jet × 3
range × 3
hydrogen × 3
aerodynamics × 2
faa-regulations × 2
jet-engine × 2
commercial-aviation × 2
general-aviation × 2
boeing-737 × 2
piston-engine × 2