The aircraft, cars, ships etc. in Tintin was always “correct”. And more so over the years.
Look out for a Danish documentary “Tintin og mig” (Tintin & moi”), 75 min., that should be released about now. Director, Anders Østergård.
It turns out that Hergé had a psychological crisis when he made “Tintin in Tibet”. Anyway one of my favourites.
Congratulations Tintin!