What does that mean sorry?

Someone1234 6 hours ago | parent | next [-]

It means any aircraft transitioning over the area at high altitude isn't impacted, because they're too high to care.

It is a ground and "everything near the ground" stop. Meaning low altitude helicopters and private aircraft have to consider it, even transitioning, but realistically commercial aircraft not taking off/landing in the area won't.

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bombcar 6 hours ago | parent | prev | next [-]

FL180 is 18000 feet, meaning that flights OVER don’t need to divert.

	▲	mazugrin2 5 hours ago \| parent [-]
		It is a pedantic but meaningful distinction that I'd only point out on a sorta geeky site like this, but actually, FL180 (or, flight level one-eight-zero) is the altitude at which an altimeter will read 18,000 feet if it's set to assume that the barometric pressure is 1013 hPa (29.92 inHg). Above a certain transition altitude, aircraft switch their altimeters from reading altitude in the local pressure to this "standard" pressure. This is because above that altitude and safely away from terrain, it's no longer important to know precisely how high you are, but it _is_ important to know what altitude you are relative to all the other aircraft nearby.

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reactordev 6 hours ago | parent | prev | next [-]

It means that you have no business being below FL180 or 18,000ft to enter this airspace.

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anovikov 6 hours ago | parent | prev [-]

That it limits local flights but not international ones as they fly higher.