UA 4607 then B6 1889 at Newark
Columbia → New York → San Juan
Timetable, New York time
14:30UA 4607 from Columbia at the gate
10:35B6 1889 to San Juan leaves the gate
20 h 05 apart on the timetable, overnight
B6 1889 leaves 20 h 05 after UA 4607 arrives on the timetable: more than half a day, so not a connection we count.