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Although a plane is pressurized it is not pressurized completely to ground or takeoff level. As the plane climbs the air pressure in the cabin is decreased with higher altitude. A typical airliner has the equivalent cabin altitude of 5,000 to 8,000 during cruise.

The difference in pressure between the cabin air and that inside the ink cartridge of the pen draws out the ink as the pressure inside the pen is more than that outside.

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