MGM, all of this depends on whether you are in Dallas or Tokyo at the time of ticketing. If you are in Dallas, the ticket can be issued at a local CTO, and you can have it before you leave.

Only "tip" I would have is that the lounge at ARN is land side, and you have to pass customs to get there. No problem, but I got my chops busted when I passed back to get on the plane. Just tell them you came to start an around the world trip and that you will stay in Stockholm longer when the trip is finished. Nice lounge, by the way.