Is there such an airline? I cannot believe such sophisticated approach. Ten out of ten chances, I think there will not be a single person who would read “KG” as “Kelvin - Gross Weight”. Moreover, when the letters “KG” is associated with a phrase “2 Fibreboard boxes X 15 KG”, every person will read it as “kilogram”. Although the Regulation uses “kg” in small letters, I do not think there is any serious problem in using “KG”, or “Kg” or “kg” for “kilogram”. This can be treated as one of the allowable “minor discrepancies” not affecting the safety of operations.