Thought this may be better on the Argentina forum than the South America airlines forum.

I've some domestic flights to book in Argentina, IGR > FTE > AEP.

Looks like I'm entitled to a free hold case as SkyTeam Elite Plus:
"Aerolíneas Plus Platinum, Gold, and Elite and Elite Plus SkyTeam members on Domestic/ Regional/ International flights: 1 additional piece with the same amount of kilos allowed by the fare type."

But looks like i wont be able to use the free case as my case will be 23kg from my initial travels and only the highest Aerolineas fare gives me a 23kg allowance.

Is there any way to get a 23kg allowance without having to splash out on the top end fare?