Allot of people are afraid of flying, and it is undoubtedly understandable given that it is a unnatural thing for us humans to do normally. Not only that but we put our lives in the hands of the airline companies, pilots and ground staff of the planes.
All that said, flying is actually the safest form of transport when you look at statistics. It can be hard for those who have great fears of flying to travel. I have known many people (my Mum included), who would talk about visiting places but then not actually go there for the sake of having to get on a plane.