I am Qantas PL and just chatted with KLM about the extra baggage and they advised, "I'm unable to determine the extra checked baggage provided by Qantas Airways. It's best to check with them to inform you accordingly. However, the checked baggage for KLM-operated flights should be up to 158 cm (length + width + height) including handles and wheels, and with a maximum weight of 23 kg." They advised me to contact Qantas who on their website state state, "Extra checked baggage allowance" with no description of what this means...
