NTN seems to be only offered by geostationary satellite operators at this point, which unfortunately puts the use case from TFA out of coverage. See for example Inmarsat's coverage: https://www.inmarsat.com/content/dam/inmarsat/corporate/core...

I'm not even sure if Skylo is live with Inmarsat at this point, or if there are any other NTN providers covering oceans.