X3 2129 then UA 181 at Frankfurt
Palma de Mallorca → Frankfurt am Main → Denver
Timetable, Frankfurt am Main time
11:30X3 2129 from Palma de Mallorca at the gate
11:10UA 181 to Denver leaves the gate
23 h 40 apart on the timetable, overnight
UA 181 leaves 23 h 40 after X3 2129 arrives on the timetable: more than half a day, so not a connection we count.