Ammonia as a fuel is an absurdly stupid idea. It is trading the lives and safety of crews and passengers for a bit of money.
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So the ammonia doesn't need to be useful in itself, but only to be able to be converted on-site to something more storable (more stable, liquefaction at lower pressure or higher temperature, and so on), or alternatively something more useful that could displace other standard CO2-intensive industrial processes.
Ammonia is NH3, there's no CO2 to store.
> alternatively something more useful that could displace other standard CO2-intensive industrial processes.
Except they are talking about using it as a fuel. If you want to displace CO2 at least use methanol, it's a liquid that's more energy dense and easier to handle safely.