WN 4968 then UA 2680 at Phoenix
Tucson → Phoenix → Houston
Timetable, Phoenix time
06:50WN 4968 from Tucson at the gate
19:53UA 2680 to Houston leaves the gate
13 h 03 apart on the timetable
UA 2680 leaves 13 h 03 after WN 4968 arrives on the timetable: more than half a day, so not a connection we count.