AA 637 then WN 1722 at Phoenix
Washington National → Phoenix → Las Vegas
Timetable, Phoenix time
20:28AA 637 from Washington National at the gate
18:20WN 1722 to Las Vegas leaves the gate
21 h 52 apart on the timetable, overnight
WN 1722 leaves 21 h 52 after AA 637 arrives on the timetable: more than half a day, so not a connection we count.