BA 1497 then BA 183 at Heathrow
Glasgow → London → New York JFK
Timetable, London time
07:15BA 1497 from Glasgow at the gate
19:20BA 183 to New York JFK leaves the gate
12 h 05 apart on the timetable
BA 183 leaves 12 h 05 after BA 1497 arrives on the timetable: more than half a day, so not a connection we count.