9I 612 then BA 138 at Mumbai
Ahmedabad → Mumbai → London
Timetable, Mumbai time
10:509I 612 from Ahmedabad at the gate
02:15BA 138 to London leaves the gate
15 h 25 apart on the timetable, overnight
BA 138 leaves 15 h 25 after 9I 612 arrives on the timetable: more than half a day, so not a connection we count.