Re the excuses given for not freighting.
Everything is flammable, the Auckland Harbour Bridge will burn if heated to a high enough temperature. Flammable in transport terms usually means something with a flash point over 60 or 90 deg C.
Greases usually contain a Group II mineral oil component, and the grease will have a flash point of around 280- deg C. That means the grease will ignite if held in an enclosed space at 280 deg C, then exposed to a naked flame. If the airline is expecting those conditions then I'd suggest a different carrier whose plane isn't going to burn up because its made of aluminium.
There are two songs, "Stairway to Heaven" and "Highway to Hell" which I think give an indication of expected traffic flow
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