BA 4200 then AZ 2422 at Madrid
Boston → Madrid → Gran Canaria
Timetable, Madrid time
08:05BA 4200 from Boston at the gatealso AY 5370, EI 5852, AA 8849
20:10AZ 2422 to Gran Canaria leaves the gatealso KL 3382, EY 4315, SV 4742, AF 4822, AM 6827, AD 6996, UX 9172, TK 9398
12 h 05 apart on the timetable
AZ 2422 leaves 12 h 05 after BA 4200 arrives on the timetable: more than half a day, so not a connection we count.