Originally Posted by NickB
Yes, I think BD is likely to come tops here, because most carriers fly to LHR and there are some onwards short-haul destinations which are not served by them, or served with limited service.
A good example on LHR-DUB would be BD 131 aka NH6885 aka OS8975 aka LH6505 aka LO4003 aka SK9775 aka JK9631 aka UA4881 aka TP8887 and also (outside *A) VS4131.
you may add UL 2131 for this flight - incredible!
on this route TG and (non-star) QR + EY have their code on some other BD flights, too.