"The specified freezing point for Jet A-1 fuel is -47ºC; analysis of fuel samples taken after the accident showed the fuel onboard the aircraft had an actual freezing point of -57ºC."
Guys, you are confusing specifications and actuals. The spec is
maximum -47C not exactly -47C. Minus 57 complies with the spec.
Kero is not known for incompatibility problems so mixing differing compositions not
currently* thought to be an issue in the industry
*Take it from me, this is currently being investigated
