I've always been surprised that BA haven't tried to involve their subsidiary BA Cityflyer more in their SH operation. Do the economics add up for E-Jets at Heathrow? It strikes me that a few of BAs SH routes (LBA springs to mind) don't quite have the capacity for an A319 but an Embraer would be a good fit. With Cityflyer's lower cost base, they could use them like US majors use regional airlines to serve smaller markets and some of the quieter lunchtime rotations. Obviously the scope agreement they have regarding use of Cityflyer would have to be significantly altered (they can't operate from LHR/LGW IIRC) and the unions would surely fight it hard. Assuming this was done though, could it work?