Why Do Planes Fly So High?

The video explains the reasons behind the high cruising altitudes of commercial jets, highlighting the efficiency and comfort benefits. It covers the history of jet development, the design considerations for flying at high altitudes, and the trade-offs involved. The video also discusses the importance of maintaining lift and the role of oxygen in jet engine combustion, concluding with the optimal altitude for efficient air travel.

How do engineers generate more lift for airplanes flying at high altitudes?

What happens to jet engines at higher altitudes regarding fuel combustion?