UA 984 then B6 1034 at San Francisco
Paris Charles de Gaulle → San Francisco → Boston
Timetable, San Francisco time
11:40UA 984 from Paris Charles de Gaulle at the gatealso AC 3298, LH 8663, SN 9011
06:00B6 1034 to Boston leaves the gatealso EY 8006, EY 8261
18 h 20 apart on the timetable, overnight
B6 1034 leaves 18 h 20 after UA 984 arrives on the timetable: more than half a day, so not a connection we count.