Title: Why Do Planes Fly So High?
Headings: 
“Why Do Planes Fly So High?”
Content: Here below are the factors and reasons why the aircraft has to travel high up in the air: • The air in the earth’s atmosphere becomes thinner as the altitude increases. When the air becomes thinner, it offers less resistance to objects flying through; this is why less thrust is required to move the aircraft. This in turn, helps the aircraft fly more efficiently. • Altitudes are defined in relation to number of feet above sea level. Pilots need to aware of the terrain over which they are flying. For example, twenty thousand feet may be suitable for southern Florida but it may not be the same if the aircraft was flying over mountains. • Cruising altitude would also depend on weather. Pilots receive weather reports and request alternate cruising altitude from air traffic control to avoid air turbulence.