AZ 4441 then UA 406 at San Francisco
Washington → San Francisco → Las Vegas
Timetable, San Francisco time
21:29AZ 4441 from Washington at the gatealso SN 8889
21:10UA 406 to Las Vegas leaves the gatealso AC 4025, VA 8562, LH 8940, NZ 9229
23 h 41 apart on the timetable, overnight
UA 406 leaves 23 h 41 after AZ 4441 arrives on the timetable: more than half a day, so not a connection we count.