At these altitudes, the air is thinner, which reduces aerodynamic drag and allows aircraft to fly more efficiently while consuming less fuel.
A typical airliner like the Boeing 787 Dreamliner or Airbus A350 often cruises around 11-12 km at speeds close to Mach 0.85.
Flying too low increases drag and fuel burn.
Flying too high reduces engine and aerodynamic performance.
That’s why every altitude is carefully calculated for maximum efficiency, safety, and range.
Thousands of meters above Earth where modern aviation performs at its best.
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