Seen in Hong Kong:

Infrared touch matrix retrofitted to a display to create touchscreen input for airport information. It worked pretty well, although the display wasn’t too crisp. (The IR bars were a little loose, which had some interesting effects.)

When you choose a desired gate or location, the map shows your location, then shows an arrow moving its way through the terminal to the goal.

The following advice appears on the frame:

Step 1: Pick up the public phone nearby.

Step 2: Press the Home button.

Step 3: Press the Contact Airport Operator button for assistance. 

There is, in fact, a pay phone just adjacent to the display:

See the Home button? Me neither. How about the Contact Airport Operator button? Uh huh.

(I wonder what the “Broadband Payphone” business is about?)