Or you could use clues like events in the user's calendar or recent emails to determine if there are any flights/hotels that need to be checked into, and ask fr

Or you could use clues like events in the user's calendar or recent emails to determine if there are any flights/hotels that need to be checked into, and ask from there. Also: the article says: "Check me in here". This has much less ambiguity than simply "Check me in" does. It could look up which location-based apps you have installed, and then open up the one that you use the most. There are plenty of ways to make magic happen :)