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oxygen × 26cabin-pressure × 7
safety × 5
medical × 4
hypoxia × 3
faa-regulations × 2
airliner × 2
commercial-aviation × 2
emergency × 2
accidents × 2
passenger × 2
fire × 2
bleed-air × 2
air-conditioning × 2
oxygen-mask × 2
air-quality × 2
military × 1
general-aviation × 1
aviation-history × 1
flight-training × 1
aircraft-systems × 1
airbus-a320 × 1
accident-investigation × 1
cargo × 1
f-16 × 1
