> Because of course everyone who goes through every airport knows which app to get for each airport, and thinks to install it in advance. Which would easily be

> Because of course everyone who goes through every airport knows which app to get for each airport, and thinks to install it in advance. Which would easily be solved by having actual standards rather than even considering that 'which app to get for each airport' should be a phrase we'd consider uttering. Then you could use a phone or watch or laptop or tablet or a kiosk.