X3 2139 then EN 252 at Frankfurt
Fuerteventura → Frankfurt am Main → Milan
Timetable, Frankfurt am Main time
23:05X3 2139 from Fuerteventura at the gate
16:40EN 252 to Milan leaves the gate
17 h 35 apart on the timetable, overnight
EN 252 leaves 17 h 35 after X3 2139 arrives on the timetable: more than half a day, so not a connection we count.