I would love to get a piece of the action at a airport BTC ATM. The last time I was in Istanbul they did not have the ATM yet, which is why I am stuck with wads of Lira. It would have been great to dump my change and turn it into BTC on my phone. There should be a machine at every airport!
Indeed, I hadn't thought of that convenience, turnign the left-over change from your trip into btc rather than back into your own currency when you are returning.