As was already noted, Herge often based vehicles in his comic books on photographs, and the accuracy of this depiction improved markedly over time. Many of the Tintin stories have also been redrawn over the years, often with changes. This can lead to many apparently anachronistic events, with Tintin flying on a BEA Trident in one story, for example, and in a SABENA Savoia Marchetti S-76 in a supposedly later story.