" I’ve heard one app developer mention you may need to reset the app's ability to maintain some proceses like location services when in the background."
How do you do that?? I did find some setting like that for other apps, not iFly. I did change the settings for anything that uses my location; apps for weather, maps, etc.
Before I made these changes, I used iFly in the airplaner today. The first thing I noted on the ground is I got the no GPS position note, then weak GPS, then it started to work. The warning notes continued to reappear. In the air everything was OK. This is using the internal iPad GPS. I did not note these with previous iOS levels. The next time I will use the Dual GPS and see what happens.