Altitude The height of a level, point or object measured in feet above ground level (AGL) or from mean sea level (MSL). Discover more from Canadian Flight Trainers Subscribe to get the latest posts sent to your email. Type your email… Subscribe Related Articles: Abbreviations and Acronyms in AviationWWFC | Canadian Flight Trainers Can HelpTC AIMFloat Rating Part 3 | How to Take-off from WaterLevel Flight and Straight Flight