Finningley
I can see only 2 types of service that would benefit from Finningley:
Low cost(Ryanair/easyjet??)
Surrounding area is quite densley populated and not well served by locos. LBA is on the wrong side of Leeds and not everyone wants to travel over the Pennines to MAN. IMO Ryanair is the obvious candidate but an Easyjet base is also possible. I am suprised that no low cost services are offered from HUY; the holiday flights seem to do well and the choice of destination increases every year.
Long haul charter
Runway length would permit long haul charters. At last an alternative to MAN in the North.
One area where Finningley will have a big advantage over LBA is access. I have used LBA 4/5 times and whilst the facilities have improved in recent years, access is appalling for an International airport. Fine if you live within 10 miles but a pain if travelling from outside the immediate area. With motorways and fast dual carriageways to the South and East of Leeds, why was the airport built to the Northwest of the city??