AZ 637 then FR 9601 at Fiumicino
Houston → Rome → Madrid
Timetable, Rome time
11:50AZ 637 from Houston at the gate
09:00FR 9601 to Madrid leaves the gate
21 h 10 apart on the timetable, overnight
FR 9601 leaves 21 h 10 after AZ 637 arrives on the timetable: more than half a day, so not a connection we count.