UA 3888 then DO 3913 at Miami
Newark → Miami → Havana
Timetable, Miami time
01:33UA 3888 from Newark at the gate
10:00DO 3913 to Havana leaves the gate
8 h 27 apart on the timetable
The last days
UA 3888 and DO 3913 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.