Where an Italian carrier might matter most

Which Second World War battle would the Italian Navy benefit from most if it had a carrier?

Matapan is a strong candidate, but early-war operations against British capital ships could matter more.

Matapan and Cape Spartivento are raised as possible tactical turning points. The broader effect would come from early carrier air power damaging British battleships and cruisers before they could dominate the theatre. Keeping a carrier operational in the early war could alter which British ships were retained in the Mediterranean. The value lies less in one famous battle than in creating repeated local opportunities for the Regia Marina.