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safety × 6
medical × 5
hypoxia × 4
faa-regulations × 3
bleed-air × 3
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airliner × 2
commercial-aviation × 2
aviation-history × 2
emergency × 2
accidents × 2
passenger × 2
high-altitude × 2
fire × 2
air-conditioning × 2
military × 1
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flight-training × 1
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aircraft-systems × 1
airbus-a320 × 1
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