by 
romansdl
ANSWERS: 1
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A Boeing 747 (and almost every aircraft) has pneumatic tires. From the web site: http://gocalipso.com/aircraft/boeing747/facts.php "The pressure in the 747's tires is about 190 to 225 psi for the main gear and 170 to 200 psi for the nose gear. They are 4 ft in diameter and are filled with Nitrogen to prevent explosions from brake heat."
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