AV 2347 then UA 1665 at San Francisco
Burbank → San Francisco → Boston
Timetable, San Francisco time
11:18AV 2347 from Burbank at the gate
23:20UA 1665 to Boston leaves the gatealso VA 8306, NZ 9018
12 h 02 apart on the timetable
UA 1665 leaves 12 h 02 after AV 2347 arrives on the timetable: more than half a day, so not a connection we count.