jabird,
There is something of an animosity between the Cornish and the Devonians ... and vice versa.
When Brymon, they did it first, combined the PLH & NQY services on to Y50 aircraft there was uproar, in this scenario, to the effect "why the hell are we going backwards via Cornwall when we want to travel from Devon to London or wherever?".
I think you'll find that the PLH punters will be using EXT, BRS, BHX, LHR, the train and/or the A38/M5 etc. rather than flocking to NQY!
NQY might just attract those, that previously used PLH, from east Cornwall but I think that'll be as far as it goes.
P.S. My local airport has an APD (terminal fee) equivalent to 15p
