It has always been a mystery to me why BHX cannot support more than two daily transatlantic flights. There should be enough willing travellers in the West Midlands - the population is large enough.
I would have expected the two daily CO flights to be achieving near full loads this summer - all the other regional transatlantic flights were full over the summer. BHX flights seemed to peak at around 80%.
Is it as simple as being too close to LHR?