What is aircraft altitude? Jeff Moyer August 06, 2013 22:19 Follow The aircraft height relative to ground level. Related articles Where does flight positional information come from? What is aircraft longitude? What is aircraft speed? How do I look up past flights? Why is the ability to track the position of my flight with FlightStats' Flight Tracker unavailable, inconsistent, inaccurate, etc.? Comments 0 comments Article is closed for comments.