UA 3987 then LF 7657 at Dulles
Columbus (Ohio) → Washington → Cleveland
Timetable, Washington time
11:55UA 3987 from Columbus (Ohio) at the gate
09:00LF 7657 to Cleveland leaves the gate
21 h 05 apart on the timetable, overnight
LF 7657 leaves 21 h 05 after UA 3987 arrives on the timetable: more than half a day, so not a connection we count.