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Are displayed flight altitudes AGL (above ground level) or MSL (mean sea level)?

April 26, 2017AGL Altitudes flight ground level mean MSL sea

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Are displayed flight altitudes AGL (above ground level) or MSL (mean sea level)?

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Altitudes displayed are the airplane’s altitude above sea level (MSL) and disregard the elevation below. This is how altimeters in aircraft operate and any attempt to reflect surface elevation or terrain would result in constant adjustments and inaccuracies For a related issue, see the above question about flight levels.