I have read a lot of Harry Potter and Percy Jackson crossovers and i don't think anyone realises this. In the Heroes of Olympus series they spend weeks trying to cross the Atlantic to get to Rome from America, but I don't think anyone realised that you would still have to cross the Atlantic to get to Britain. I would put it in my story but I can't be bothered to change it so just keep this in mind if your are thinking of doing this type of story.
