True, it will be much easier for people from Leeds/Sheffield/North East England to get to Finningley than to Manchester.
But why are you all concentrating on passenger airlines?
I suspect its main use will be for freight:
long runway
excellent road connections - M1, M18, can avoid Birmingham
excellent rail - fast east coast line
very cheap labour force (ground staff)- area hit very hard by pit closures
cheap housing - see above
no complaints - see above; thousands of local people signed a petition FOR the development of the airport