Back then I'm pretty sure I said it wouldn't start until 2020...
Still easily time for me to be right...
The uptime from Airwave is significantly better than from any commercial 4G network, and it has to be. Lives really do depend on it.
The capabilities of the network are fundamentally different from the commercial networks, and running them over 4G 'broadband' really is a kludge in many ways - I'm sure it will sort-of work eventually...
The redundancy and continual testing of UPS/failover (i.e. they know that the fallback site works, because it was the primary a couple of months ago, and was actively tested last week) is not something that the mobile providers have ever needed to take seriously.
Biting the hand that feeds IT
