That's what I was wondering. Does shut down mean no foot/vehicular traffic, but people can still fly... Does it mean no one in or out? I recently went to Tucson to take care of my diploma authentication and I thought the crossing would be a pain in the ass. I went by bus and it has to be the most stress free, chill crossing I have ever experienced. Even the Border Patrol was super nice and chill. So strange, but I'll take it. I don't have to go back for any reason any time soon, so I can weather it, but I'm still curious as to what that will entail.