As Apple runs out of stock of the iPad 4, it will be replacing the device that consumers bring in for service with the newfangled iPad Air 2.
Apple iPad Air 2 April 17, 2017
Apple launched an updated version of its 9.7-inch iPad in March. Although the device replaced the company's aged iPad Air 2, it seems to still retain quite of a few features of the previous generation iPad.
Apple iPad Air 2 April 11, 2017