iMazing should do it.
The free trial will do. http://imazing.com
Make sure you tell it to extract the data and it'll push out the entire app and you can just throw it on the iPad through iTunes or even through iMazing itself.
iMazing. It worked. Thank you so much. SO easy to use also
For anyone else.
Make sure new device (iPad air 2) does not have the app installed.
1) Using imazing click on app for the old device (iPad mini).
2) Select app (pvz2)
3) Click copy to mac (put in a folder you created.
4) Select app and data when prompted
5) Hook up new device and click on that device in amazing.
6) At bottom click copy to device.
7) It should be one file in that folder
8) Select app and data when prompted.
That is all.