AA 9975 then AA 1526 at Philadelphia
Roanoke → Philadelphia → Houston
Timetable, Philadelphia time
15:24AA 9975 from Roanoke at the gate
12:53AA 1526 to Houston leaves the gate
21 h 29 apart on the timetable, overnight
AA 1526 leaves 21 h 29 after AA 9975 arrives on the timetable: more than half a day, so not a connection we count.