Aviophobia refers to a pervasive and irrational fear of flying. This phobia, in our modern era on jet travel, can prove very inconvenient and limiting by causing the victim to need to travel by means of ground travel. The precise cause of this phobia is not understood but is probably based on the fact is that travel above the Earth is not natural for humans, and the very present reality of airplane crashes. Interestingly, however, air travel is a statistically safer way to travel than any ground-based transport. Treatment for this phobia includes the use of anti-anxiety meds and cognitive-behavioral therapy.