Nitrogen because it's inert and does not contain moisture.
I could only find American companies that offer used airplane tires. Here are the links.
Aircraft tires can be filled with regular compressed air, however pure nitrogen is also often used.
Nitrogen is a dry, inert gas used to inflate airplane tires, off-road truck tires, military vehicle tires, and race car tires for improved performance, more tire mileage and better fuel economy.
They are multi-ply tires filled to very high pressure. Most jet and large airplane tires are filled with nitrogyn.
Air
Helium is lighter than air. So, tires filled will helium will help the tire rise up in the air.
Nitrogen can be used to inflate airplane tires, off-road truck tires, military vehicle tires, and race car tires for improved performance, more tire mileage and better fuel economy.hope it helped :)
The address of the Airplane Filling Station Preservation Association is: Po Box 1331, Powell, TN 37849-1331
To avoid accidents when the airplane is landing.
Nitrogen is filled in aeroplane tyres.
i maen pericles