AA 1541 then DL 1697 at Phoenix
Las Vegas → Phoenix → Boston
Timetable, Phoenix time
17:59AA 1541 from Las Vegas at the gate
14:20DL 1697 to Boston leaves the gate
20 h 21 apart on the timetable, overnight
DL 1697 leaves 20 h 21 after AA 1541 arrives on the timetable: more than half a day, so not a connection we count.