UA 2009 then UA 3755 at Houston
Las Vegas → Houston → Lubbock
Timetable, Houston time
05:55UA 2009 from Las Vegas at the gate
22:10UA 3755 to Lubbock leaves the gate
16 h 15 apart on the timetable
UA 3755 leaves 16 h 15 after UA 2009 arrives on the timetable: more than half a day, so not a connection we count.