11 of45 Fuselage Shape Training
  picture of a cross-section 
of a fuselage Since commercial planes fly at 30,000 feet or more, air is forced into the cabin to make up for the lack of air at high altitudes. This allows passengers to breathe normally during a flight. Because a cylinder is round on the inside, it can maintain its shape as air is forced into the cabin and the air pressure increases.
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