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Why most helicopters aren't pressurized

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Unlike an airliner that seals you in a nice, breathable bubble, typical passenger helicopters are extremely leaky metal boxes. Because they generally don't fly high enough to suffocate anyone, manufacturers simply don't bother pressurizing them. If you take one up to 15,000 feet, you are entirely on your own for oxygen.

Why most helicopters aren't pressurized
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