To try to clarify:
The term "freezing point" for Jet-A1 is maybe somewhat misleading. It's basically the temperature below where the normally "transparent" fuel shows its first traces of "milkiness". Diesel guys refer to this as the Cloud Point. The flow is not impaired at this temperature.
The dangeruos temperature is where the fuel has thickened so much it's practically not a liquid anymore. Diesel guys refer to this as the CFPP or Cold Filter Plugging Point. For Jet-A1, I've not seen a corresponding term, presumably because this temperature range below the "freezing point" is a no-go area that provides the required safety margin.
For diesel, the temperature margin between the CP and CFPP can be between -5 and -15 degrees C depending on fuel composition, fuel system design and probably other factors as well. In land vehicles one may utilize this margin, but it pays to be prepared for filter clogging. I saw a corresponding figure of -6 degrees C for Jet-A1, but there is obviously some variation in this case too.