LH 447 then 4Y 900 at Frankfurt
Denver → Frankfurt am Main → Dubrovnik
Timetable, Frankfurt am Main time
10:55LH 447 from Denver at the gate
09:254Y 900 to Dubrovnik leaves the gate
22 h 30 apart on the timetable, overnight
4Y 900 leaves 22 h 30 after LH 447 arrives on the timetable: more than half a day, so not a connection we count.