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Most likely, neither. When an airplane is flying above FL 180 (18,000 feet above sea level, or 18,000 MSL) in the United States, the altimeter readings are read out based on 'pressure altitude'.

Normally altitude is determined by an instrument (altimeter) that utilizes the barometric readings reported at ground reporting stations over which you are flying. However, when cruising at or above FL180, pilots use 'pressure altitude', where the altimeter is set to use 29.92 inches Hg as the barometric pressure for readings. This helps to prevent having to change the instrument settings continuously to match the ground stations, and ensures that pilots flying at these higher altitudes all have the same reference setting for height.

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