Reading @pluralistic's take on battery bombs and security theatre here:

https://pluralistic.net/2024/12/06/shoenabombers/#paging-dick-cheney

I was struck by an idea ...

1. Supply chain attack on iPhones to install PETN battery bombs and malware
2. Malware on iPhone bombs tracks location and looks for barometric pressure reported by a Watch Ultra (they have an altimeter)
3. Phone set to explode when Watch visits an airport then altitude increases from surface level to over 2000 metres in under 5 minutes

Brrr!