What is aircraft altitude? Jeff Moyer August 06, 2013 22:19 Follow The aircraft height relative to ground level. Related articles What is aircraft longitude? Where does flight positional information come from? Why is the ability to track the position of my flight with FlightStats' Flight Tracker unavailable, inconsistent, inaccurate, etc.? Can you tell me more about FlightStats' data sources? Comments 0 comments Article is closed for comments.