Near to zero proportion of people travel FROM aeroplanes, Not a nice way to die! However you must mean travel IN or BY aeroplane. I can't answer this unless you specify which journey you are talking about.
If you are talking about New York to London, or anywhere that entails crossing an ocean, then it's going to be around95% but if you're talking of, say, Cheyenne to Denver, then it may only be 10% or less. Think out your question carefully and consider what options of travel there are and whether any are really feasible if you don't like the idea of flying.
However, statistically, flights are safer than road travel although it never seems that way when you are considering getting on board, does it?