AA 1922 then UA 1609 at DFW
Las Vegas → Dallas-Fort Worth → Houston
Timetable, Dallas-Fort Worth time
19:06AA 1922 from Las Vegas at the gate
17:25UA 1609 to Houston leaves the gate
22 h 19 apart on the timetable, overnight
UA 1609 leaves 22 h 19 after AA 1922 arrives on the timetable: more than half a day, so not a connection we count.