IF THE BHD-LCY turns out to be accurate.....
When has Belfast to London City EVER worked? My own feeling is that LCY is perceived as a mainly business destination. Is there a big enough financial services type base in Belfast to support it? Is there enough demand to support it coming FROM the LCY area? I seriously doubt it.
Did Flybe not do this as a stopping service via IOM and it failed? City Ireland had a go and it failed ...and I seem to recall some operation before both of those but cannot recall the name of the operator.
I hope it works for Flybe......but based on the previous evidence...I doubt it.