The AR app guides passengers through the airport using the camera view of their smartphone, making it easier to locate check-in areas, departure gates and baggage belts. This is significant as satellite-based GPS systems are usually blocked in the terminal. The app can be used both to send reminders to passengers and to locate them in the terminal. So if a passenger is running late, the airline can use the location from the beacon to decide whether or not to wait for the passenger to board.