Correct re the crew visa. And from what I understand the process of getting the visa from the US Consulates is extremely frustrating - courtesy of American paranoia and xenophobia in this brave new world. And whilst Aussie holiday-makers are exempt and don't need to go through the process, those untrustworthy crew do.
The Yanks should just ban foreign pilots from being on the flight-decks of aircraft flying into the States. Be simpler and "safer". but I really shouldn't speak my mind out loud - some one might take that idea up......