The next iPad Air may not only have a larger display and a more powerful chipset than the current model, but it may be cheaper too. The iPad Air 2020 is believed to feature a 10.8-inch or 11-inch display and an A13 Bionic SoC, which would both be improvements over the 10.5-inch display an A12 Bionic in the current model.
https://www.notebookcheck.net/Apple-could-be-making-the-next-iPad-Air-cheaper-than-its-predecessor.482771.0.html