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A problem confronting these airframe designers is that by flying higher than Concord, they enter the ozone layer. There are so few Concords or other planes flying at or above those altitudes meaning that ozone depletition is not a problem. However if used for extensive commercial traffic, then those planes must use ozone friendly fuels. Last I read, this problem had not been solved AND was still debated as to whether it would be a problem. Once Reagan's hypersonic airplane became irrelevant, a worry over ozone depletion disappeared with it.
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