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A comment on Enroute Airbus A380 wake flips Challenger business jet upside down. Parent comment

Re:Enroute Airbus A380 wake flips Challenger business jet up... by ajross on Thursday March 16, 2017 @11:35PM (#13891238)
Technically, a flight level isn't a distance measurement at all. It's defined by atmospheric pressure, so that all planes use the same "ground" barometer by definition. The feet are expressed nominally relative to a standard sea level pressure.
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Re:Enroute Airbus A380 wake flips Challenger business jet up... by goodcanadian on Friday March 17, 2017 @12:10AM (#13891404)
That is absolutely correct. I thought about mentioning it, but did not. Flight levels are definitely expressed as "pressure altitudes" rather than absolute altitudes. The air pressure (or rather density) is the more important number when it comes to keeping an aircraft in the air, anyway.
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