Given that airliner tires or tyres are generally retreaded between 5 and 7 times over the life of the carcass, it is a pretty good bet that this tyre or tire had been retreaded. But note, airliner retreads should be roughly as safe as new ones. These aren't truck tires that were retreaded in the back of Uncle Eddie's garage and which you see the leavings of spewed across our high speed roadways.