About 25pc of passengers are afraid of flying to some extent, an extraordinarily high number, and 10pc have a great fear of flying. IATA monitors scheduled commercial flight safety using a five-year rolling average to account for yearly statistical spikes. Fear of flying courses achieve results for many participants. Aer Lingus periodically runs fear of flying courses while Aviatours also offers them. On North Atlantic routes the vertical distance between aircraft flying in the same direction has reduced to 1,000 feet, which TCAS makes perfectly safe.