F9 3971 then AA 1613 at Phoenix
Dallas-Fort Worth → Phoenix → Las Vegas
Timetable, Phoenix time
11:31F9 3971 from Dallas-Fort Worth at the gate
11:20AA 1613 to Las Vegas leaves the gate
23 h 49 apart on the timetable, overnight
AA 1613 leaves 23 h 49 after F9 3971 arrives on the timetable: more than half a day, so not a connection we count.