O flights and transfers

[Baz-t]

We have had 10 cruises with Oceania over the past 15 years but have never used O flights. However, we now have a potential problem with our Vista cruise in May next year no longer embarking at Venice, embarking in Trieste instead. 
My question is what O flights are being offered and where do they fly to, Venice Marco Polo airport or Trieste. If Venice, are Oceania offering transfers from Marco Polo airport. If so, I would be inclined to use O flights and transfers.

Non stop flights are currently not available from the U.K. to Trieste, so I would prefer to fly to Venice.