Here is an excellent leather case for the Apple iPad Air. It is like a smart cover but it also covers the back. Here are its list of features.
Magnetic strip built inside for secure closure with sleep/awake function.
Specifically designed for the Apple iPad Air 5 5G 5th Generation
Cover has flip capability to transform the case into a horizontal stand and position for typing.
All features are accessible (camera and speaker hole available)
This is a one piece case, the front and back does not separate.