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NOVA: So we're 4,077 feet.



JACK: Well, that's MSL.



NOVA: MSL, what does that mean?



JACK: Mean Sea Level.



NOVA: OK



JACK: You're up here with a couple of fixed-wing pilots.



NOVA: OK, this is what I want to hear. Mean Sea Level meaning.....above sea level.



JOE: Above the mean level of the sea.



NOVA: OK, so it's obviously not 4,000 feet above the ground?



JOE: No, that's AGL, Above Ground Level.



NOVA: AGL is Above Ground Level. OK so...



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