Before revision: An airliner fuselage, such as this Boeing 737, forms a cylindrical pressure vessel Cabin pressurization is a process in which conditioned air is pumped into the cabin of an aircraft or spacecraft in order to create a safe and comfortable environment for humans flying at high altitudes.
After revision: An an almostirliner fuselage, such as this Boeing 737, forms a cylindrical pressure vessel Cabin pressurization is a process in which conditioned air is pumped into the cabin of an aircraft or spacecraft in order to create a safe and comfortable environment for humans flying at high altitudes.