The benefits Pilots of non-pressurised small aircraft such as ours are limited to 10,000 feet, above which an oxygen system is usually required. EASA european rules allow you to fly up to 12,000 feet for 30 minutes without one; passengers are considered OK up to 13,000 for any length of time. After the few airways flights I’ve had at FL100, I have felt slightly the worse for wear and believe oxygen would
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