On Apple's devices, you cannot disable that BLE broadcast. The same is true on the Pixel 8: https://www.theverge.com/2024/4/8/24123909/google-pixel-8-pr.... That's the whole point of this design, and fundamentally different than just having some app ping a server once in a while so long as it has network access.
Beats me. I can't find anything definitive on this. Since Apple devices continue to broadcast Find My signals even when powered off (as long as they have a little bit of battery left), I assume they continue to do so in airplane mode.
It wouldn't do a lot of good if thieves could just turn off Bluetooth, right?
It turns off celular which is the main problem
(Wifi is common enough in modern airplanes so I have to assume the interference risk is low, same for Bluetooth)