Ordinary rubber is an insulator. But special rubber tyres ofaircraft are made slightly conducting. Why is this necessary?

Ordinary rubber is an insulator. But the special rubber tyres of aircrafts are made slightly conducting. This is because during landing or takeoff, the tyres of aircrafts get charged due to friction between tyres and fround. In case, the tyres are slightly conducting, the charges developed on the tyres will not stay on them and find its way to earth