AC 7020 then UA 4548 at Dulles
Dallas → Washington → Cleveland
Timetable, Washington time
15:59AC 7020 from Dallas at the gate
12:50UA 4548 to Cleveland leaves the gate
20 h 51 apart on the timetable, overnight
UA 4548 leaves 20 h 51 after AC 7020 arrives on the timetable: more than half a day, so not a connection we count.