AI 173 then UA 8156 at San Francisco
New Delhi → San Francisco → Boston
Timetable, San Francisco time
07:00AI 173 from New Delhi at the gate
11:32UA 8156 to Boston leaves the gate
4 h 32 apart on the timetable
The last days
AI 173 and UA 8156 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.