A general aviation aircraft operating under Part 91 in non-commercial service is permitted to attempt a takeoff in any visibility, even zero. This has always seemed surprisingly risky and almost like a regulatory loophole to us, but that's the FAA for you. As if to err on the too-conservative side for organized commercial operations, the FAA requires singles and twins have a mile visibility for takeoff unless the airport specifically authorizes lower. This is as restrictive a requirement as permitting a zero-zero takeoff is surprisingly loose. Of course, it doesn't end there.
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