This is not a permissible open jaw. It is 2 one ways. A round trip ticket does not apply. A permissible open jaw would be…
the distance between your OJ can not be greater than the distance between your other cities on the ticket… Rome to FLL is a greater distance.
Don’t think you need the explanation, just trying to tell you it does NOT qualify as a roundtrip or a permissible OJ ticket.
TA itineraries would have to be one way tickets.
EZAir has special rates with the cruiselines…Consolidator's AIr Cruise prices. That’s why they can offer good one way fares.
Sorry, other than mileage points, or searching for airline one way tickets, IDK what else to tell you.