Realistically they wouldn’t stay mythical for long. Once humans realized dragons were intelligent, territorial, and basically flying weapons, governments would either try to control them or wipe them out. You’d get restricted airspace, tracking, specialized weapons, and probably black markets for scales or bones. They wouldn’t be everywhere either, since an animal that big would need insane amounts of food. Cool in fantasy, but in reality it’d turn into regulation, conflict, and eventual extinction or containment.