An Airport App Takes You Outside, to a Rental Car Gate Guru, the app that functions like a Yelp for travelers who want to eat, shop or even get a manicure at an airport, is venturing into new territory. In a new version for Apple and Android devices released late last month, the app has partnered with the Avis-Budget Group to offer discounted last-minute car rentals. It may seem like an off-brand use, but it isn't: the feature is made for the smartphone-carrying traveler who may need to secure a car as the plane is taxiing to the gate. "All of this came about as a result of thinking through the current airport rental car experience," said Dan Gellert, GateGuru's chief executive and co-founder, adding that the app improves on an outmoded system that relies on walk-up customers. The app's other new functions include a new interface, updates on wait time in the security line you'll have to go through and listings of restaurants near your departure gate.