DL 2305 then AA 624 at DFW
Boston → Dallas-Fort Worth → Las Vegas
Timetable, Dallas-Fort Worth time
23:03DL 2305 from Boston at the gate
22:45AA 624 to Las Vegas leaves the gate
23 h 42 apart on the timetable, overnight
AA 624 leaves 23 h 42 after DL 2305 arrives on the timetable: more than half a day, so not a connection we count.