iOS/Android: Being afraid of flying severely limits your travel options, but how can you overcome this very common phobia? Flight App VALK is a mobile app that offers reassurance and relaxation activities both before and during your flight.
Key features of the app include information on flying to reassure users, relaxation techniques for use in flight and a 'panic button' which activates an immediate audio message from a therapist. I've never been afraid of flying, so I'm no position to assess if this might work, but if that is an issue for you, it might be worth a shot. (The one obvious downside is that you can't use the app during takeoff).
Flight App VALK is a download for iOS ($4.49) and Android ($3.77) devices.