At higher altitudes, where atmospheric pressure is lower, oxygen enters the body less readily, leading to the hypoxic state.

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"The political leaders of these countries don't receive help from other colleagues in the union that could lower their interest rates and provide oxygen for growth initiatives and investment, " said Guy Verhofstadt, a member of the European Parliament and former prime minister of Belgium.

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However, much of the oxygen was removed from the lower end of the equity market food chain by amendments to the crowdfunding provisions of the JOBS Act, which were motivated by concerns of potentials for fraud on small investors.

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This architecture also enables NASA to leverage existing capabilities and lower development costs by using liquid hydrogen and liquid oxygen for both the core and upper stages.

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Along the lower Mississippi some have proposed diversions through wetlands as a way to mitigate oxygen starvation.

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While this is happening, the passengers will be provided with oxygen from drop-down masks which will give them oxygen for 12 to 15 minutes, by which time the aircraft should be at a lower level.

BBC: NEWS | Europe | Dangers of aircraft decompression