AA 2550 then AA 1607 at DFW
Knoxville → Dallas-Fort Worth → Cleveland
Timetable, Dallas-Fort Worth time
18:58AA 2550 from Knoxville at the gate
16:00AA 1607 to Cleveland leaves the gate
21 h 02 apart on the timetable, overnight
AA 1607 leaves 21 h 02 after AA 2550 arrives on the timetable: more than half a day, so not a connection we count.