In Harry Potter & The Chamber Of Secrets, when Harry and Ron fail to cross the 9&3/4 barrier, they use their flying Ford Anglia instead to fly to Hogwarts.
It is implied that there is some sort of barrier between the Muggle World and Wizarding World (at least the Hogwarts Express platform).
But it is unclear how they bypassed that barrier while flying using the Anglia. Has there been a canon explanation to this?
And how exactly did Ron know the route to Hogwarts and the train route of the Hogwarts Express (they cross their paths with Hogwarts Express in the movie) ?