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The cabin actually was pressurised, though to a higher cabin altitude than on most aircraft - the pressure suits were needed for depressurisation and ejection. I'm guessing that the pure oxygen atmosphere was chosen for similar reasons as the space program, which shifted to a nitrogen/oxygen atmosphere at sea level pressure.Operating at higher cabin pressures and near-natural atmosphere would eliminate the need to prebreathe, and the pressure suit would only be needed in an emergency .
The cabin actually was pressurised, though to a higher cabin altitude than on most aircraft - the pressure suits were needed for depressurisation and ejection. I'm guessing that the pure oxygen atmosphere was chosen for similar reasons as the space program, which shifted to a nitrogen/oxygen atmosphere at sea level pressure.
Operating at higher cabin pressures and near-natural atmosphere would eliminate the need to prebreathe, and the pressure suit would only be needed in an emergency .
