what is the earliest addition of Ipad that is compatible with this Dji pilot app

Hi! You might be better off posting your question in the 'products' section of this forum.  That is way more active.

Hello there. Good day and thank you for the inquiry. As of the moment we do not have any information with regards to this matter and with DJI's future updates and compatibility. Kindly please stay tuned to the latest news, events and updates by subscribing to DJI official website at www.dji.com or following us on social media ( Facebook: https://www.facebook.com/DJI , Twitter: https://twitter.com/djiglobal , YouTube: https://www.youtube.com/user/djiinnovations ) for further details. Thank you for your support.