I got my Mavic Air on last june and from june till the end of september I did a lot of flights using my mother's spare cellphone, I only connected that cellphone to the internet to update batteries three to four times. When I got a new iPad, I started using it to flight and forgot about my mother's cellphone, but when I wanted to sync my flight data, I discoverd she deleted the app and the app data. I tried reinstalling it and synching (synch all), and no all flight record appeared.

Is there a way I can recoverd those old flight records?

Hi Idrialis, we're sorry to read your post. If the App has been deleted and the flight records have not been synced successfully, I'm afraid that they cannot be found anymore.
Anyway, you may refer to the below and try to export the file manually to see whether there is any luck.

For Android devices, please connect the device to the computer, find the flight records stored in …\DJI\dji.pilot\FlightRecord\, and copy the required flight records to the computer.
For iOS devices, please connect the device to the computer, launch the iTunes, find the flight records in the DJI GO app, and copy the FlightRecord folder to the computer.

DJI Susan Posted at 2018-10-22 20:24
Hi Idrialis, we're sorry to read your post. If the App has been deleted and the flight records have not been synced successfully, I'm afraid that they cannot be found anymore.
Anyway, you may refer to the below and try to export the file manually to see whether there is any luck.

Thank you very much Susan, I'll give this a try.

Idrialis Posted at 2018-10-22 20:26
Thank you very much Susan, I'll give this a try.

You are welcome. If there is anything else we can help, feel free to contact us.