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high-altitude × 88altitude × 7
aerodynamics × 6
aircraft-performance × 6
aircraft-design × 5
jet-engine × 5
glider × 5
stall × 4
supersonic × 4
electric-engine × 4
helicopter × 3
takeoff × 3
weather × 3
airspeed × 3
balloon × 3
sr-71 × 3
oxygen × 3
sailplane × 3
faa-regulations × 2
safety × 2
air-traffic-control × 2
airliner × 2
commercial-aviation × 2
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