Why do commercial planes fly at 35,000 feet?

Question

Why do commercial planes fly at 35,000 feet?

In: 13

Answer 1

Its where most planes find the right balance of efficiency. If they where lower, more air sucked in the engines for thrust but more air resistance over the entire plane. Higher = less air resistance but the planes need to fly faster and less efficient just to keep enough air over the wings to stay up.

Answer 2

Its where most planes find the right balance of efficiency. If they where lower, more air sucked in the engines for thrust but more air resistance over the entire plane. Higher = less air resistance but the planes need to fly faster and less efficient just to keep enough air over the wings to stay up.