Aerophobia, or fear of flying, may be associated with numerous other phobias. Sometimes it appears on its own. The fear of flying is estimated to affect as many as 25% of people, although a full-blown phobia is significantly less common. Travel delays, common when flying at popular times, can make the fear of flying worse. Whether or not your fear of flying has developed into a phobia, it can have devastating effects on your quality of life.