OS 553 then FR 6926 at Fiumicino
Vienna → Rome → Barcelona
Timetable, Rome time
14:15OS 553 from Vienna at the gate
05:55FR 6926 to Barcelona leaves the gate
15 h 40 apart on the timetable, overnight
FR 6926 leaves 15 h 40 after OS 553 arrives on the timetable: more than half a day, so not a connection we count.