What is FL?

I saw a wikipedia post about FL but can someone explain me, what exactly is FL400?

40,000 ft. MSL (Above sea level).

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FL400 is forty thousand feet. FL stands for flight level and it starts at FL180 (18,000ft)

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Flight Level, is the level of which altitude you are at. FL400 is 40.000FT, FL300 is 30.000FT and so on. Basically its your Altitude in feet, divided by 100.
FL350 - 35.000FT
FL250 - 25.000FT
FL150 - 15.000FT
FL050 - 5000FT
FL005 - 500FT

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Thanks to all of you!

FL means Flight Level and is the height,measured in feet, from the surface of the sea. For example FL400 is 40,000ft.

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FL = Flight Level

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FL stands for flight level.
Example: ABC climb to flight level 350. ABC is instructed to climb to 35,000ft.

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FL=ft/100

E.g. 34500 ft = FL345

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FL means flight level but also Florida :)

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No need to explain what it means several times if someone has already explained

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Flight level

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Your partially correct, Flight Level starts at FL180 :)

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That explains why the ATC in IF changes from FL to ft at certain altitudes.

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Not necessarily. In real life, flight levels start above the transition altitude which can change from airspace to airspace. 18 000ft only happens in America. Elsewhere, you will mostly find (roughly) 5000ft transition altitudes in controlled airspaces. In uncontrolled airspaces, you must set your altimeter to 1013,25 hPa (29,92 inHg) above 3000ft (or 1000ft AGL, just pick the highest one).

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A flight level cannot be associated to a ‘height’. It’s an altitude pressure. The word ‘height’ is used when your altimeter is set to the QFE of the airfield.

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I guess you learn something new everyday :)

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