AA 2978 then UA 6030 at Phoenix
Mazatlan → Phoenix → San Diego
Timetable, Phoenix time
16:35AA 2978 from Mazatlan at the gate
16:30UA 6030 to San Diego leaves the gate
23 h 55 apart on the timetable, overnight
UA 6030 leaves 23 h 55 after AA 2978 arrives on the timetable: more than half a day, so not a connection we count.